47 + Interview Questions in BOAT AND STREAMS in Mathematics Page 1 InterviewSolution

1.	A motorboat in still water travels at a speed of 36 kmph. It goes 56 km upstream in 1 hour 45 minutes. The time taken by it to cover the same distance down the stream will be :1). 2 hours 25 minutes2). 3 hours3). 1 hour 24 minutes4). 2 hours 21 minutes
Answer» 3). 1 HOUR 24 MINUTES

Discussion

2.	A man rows a boat 18 kilometres in 4 hours downstream and returns upstream in 12 hours. The speed of the stream (in km per hour) is :1). 12). 1.53). 24). 1.75
Answer» This QUESTION was ASKED some where in PREVIOUS year papers of SSC, and correct answer was 1.5

Discussion

3.	A man rows 750 m in 600 seconds against the stream and returns in $7\frac{1}{2}$ minutes. Its rowing speed in still water is (in km/hr).1). 5.52). 5.753). 54). 5.25
Answer» 5.25 is the CORRECT ANSWER as PER the SSC answer KEY

Discussion

4.	The speed of a boat along the stream is 12 km/h and against the stream is 8 km/h.The time taken by the boat to sail 24 km in still water is1). 2 hours2). 3 hours3). 2.4 hours4). 1.2 hours
Answer» CORRECT ANSWER is: OPTION 3

Discussion

5.	A man can row 15km/hr downstream and 9 km/hr upstream. The speed of the boat in still water is1). 8 km/hr.2). 10 km/hr.3). 15 km/hr.4). 12 km/hr.
Answer» ANSWER for this QUESTION is OPTION 4

Discussion

6.	A man rows down a river 15 km in 3 hrs, with the stream and returns in $7\frac{1}{2}$ hrs. The rate at which he rows in still water is1). 2.5 km/hr2). 1.5 km/hr3). 3.5 km/hr4). 4.5 km/hr
Answer» RIGHT ANSWER for this QUESTION is OPTION 3

Discussion

7.	The speed of the current is 5 km/hour. A motorboat goes 10 km upstream and back again to the starting point in 50 minutes. The speed (in km/hour) of the motorboat in still water is1). 202). 263). 254). 28
Answer» 26 is the BEST SUITED

Discussion

8.	A man can swim at the rate of 4 km/ hr in still water. If the speed of the water is 2 km / hr, then the time taken by him to swim 10 km upstream is1). $2\frac{1}{2}$ hrs2). $3\frac{1}{2}$ hrs3). 5 hrs4). 4 hrs
Answer» Its TOUGH but OPTION 3 SEEMS CORRECT

Discussion

9.	A moter boat covers a certain distance downstream in a river in 3 hours.It covers the same distance upstream in 3 hours and a half.If the speed of water is 1.5 km/h,then the speed of the boat in still water is :1). 17 km/h2). 19.5 km/h3). 17.5 km/h4). 19 km/h
Answer» is OPTION 2 is the CORRECT ANSWER am i RIGHT

Discussion

10.	A boat covers 24 km upstream and 36 km downstream in 6 hours, while it covers 36 km upstream and 24 km downsteam in $6\frac{1}{2}$ hours. The speed of the current is1). 1 km/hr2). 2 km/hr3). 1.5 km/hr4). 2.5 km/hr
Answer» 2 km/hr SEEMS CORRECT.

Discussion

11.	Speed of a boat is 5km per hour in still water and the speed of the stream is 3 km per hour. If the boat takes 3 hours to go to a place and come back, the distance of the place is :1). 3.75 km2). 4 km3). 4.8 km4). 4.25 km
Answer» RIGHT ANSWER for this QUESTION is OPTION 3

Discussion

12.	Speed of a boat along and against the current are 12 km/hr and 8 km/hr respectively. Then the speed of the current in km/hr is1). 52). 43). 34). 2
Answer» ANSWER for this QUESTION is OPTION 4

Discussion

13.	A boat moves downstream at the rate of 1 km in $7\frac{1}{2}$ minutes and upstream at the rate of 5 km an hour.What is the speed of the boat in the still water 1). $3\frac{1}{2}$ km/hour2). $6\frac{1}{2}$ km/hour3). 4 km/hour4). 8 km/hour
Answer» it from previous YEAR ssc PAPERS, $6\frac{1}{2}$ km/hour is the RIGHT answer

Discussion

14.	A sailor goes 12 km downstream in 48 minutes and returns in 1 hour 20 minutes. The speed of the sailor in still water is :1). 12 km/hr2). 12.5 km/hr3). 13 km/hr4). 15 km/hr
Answer» i THINK OPTION 1 is CORRECT

Discussion

15.	A man can row 30 km downstream and return in a total of 8 hours. If the speed of the boat in still water is four times the speed of the current, then the speed of the current is1). 1 km/hour2). 2 km/hour3). 4 km/hour4). 3 km/hour
Answer» is OPTION 2 is the CORRECT ANSWER am i RIGHT

Discussion

16.	A person can row $7\frac{1}{2}$ km an hour in still water and he finds that it takes him twice as long to row up as to row down the river.The speed of the stream is :1). 2 km/hr2). 3 km/hr3). $2\frac{1}{2}$ km/hr4). $3\frac{1}{2}$ km/hr
Answer» I THINK OPTION 3 is the RIGHT ANSWER

Discussion

17.	The speed oi a boat in still water is 10 km/ hr. It covers (upstream) a distance of 45 km in 6 hours. The speed (in km/hr) of the stream is1). 2.52). 33). 3.54). 4s
Answer» OPTION 1 is the RIGHT ONE

Discussion

18.	Speed of motorboat in still water is 45kmph. If the motorboat travels 80 km along the stream in 1 hour 20 minutes, then the time taken by it to cover the same distance against the stream will be1). 3 hours2). 1 hour 20 minutes3). 2 hours 40 minutes4). 2 hours 55 minutes
Answer» OPTION 3 is the RIGHT ANSWER

Discussion

19.	A man can row at 5 kmph, in still water. If the velocity of current is 1 kmph. and it takes him 1 hour to row to a place and come back, how far is the place 1). 2.5 km2). 3 km3). 2.4 km4). 3.6 km
Answer» Its TOUGH but OPTION 3 SEEMS CORRECT

Discussion

20.	A boat can travel with a speed of 13 km/hr in still water. If the speed of stream is 4 km/hr in the same direction, time taken by boat to go 63 km in opposite direction is1). 9 hrs2). 4 hrs3). 7 hrs4). $3\frac{9}{17}$ hrs
Answer» 4 hrs : OPTION 3 is the CORRECT ANSWER

Discussion

21.	A boat goes 20 km downstream in one hour and the same distance upstream in two hours. The speed of the boat in still water is1). 15 km/hr.2). 10 km/hr.3). 5 km/hr.4). 7.5 km/hr.
Answer» 15 km/hr. : OPTION 1 is the CORRECT ANSWER

Discussion

22.	A boat goes 12 km downstream and comes back to the starting point in 3 hours. If the speed of the current is 3 km/ hr, then the speed (in km/ hr) of the boat in still water is1). 122). 93). 84). 6
Answer» Take option B So, downstream speed is 3+9=12And UPSTREAM speed is 9-3=6 To travel 12 km downstream it TAKES 1 hr And to travel 12 km upstream it takes 2 hr TOTAL time taken = 1+2 =3 hr to go and back.Hence option b is correct.

Discussion

23.	Two boats A and B start towards each other from two places, 108 km apart. Speed of the boat A and B in still water are 12km/hr and 15km/hr respectively. If A proceeds down and B up the stream ,they will meet after.1). 4.5 hours2). 4 hours3). 5.4 hours4). 6 hours
Answer» it from PREVIOUS year ssc PAPERS, option 2 is the RIGHT answer

Discussion

24.	The speed of a stream is 3 km/hr, and the speed of a man in still water is 5 km/ hr. The time taken by the man to swim 26 km downstream is :1). $8\frac{2}{3}$ hrs.2). $3\frac{1}{4}$ hrs.3). 13 hrs.4). $5\frac{1}{5}$ hrs.
Answer» $3\frac{1}{4}$ HRS. is the BEST SUITED

Discussion

25.	A man can swim 3 km/hr,in still water. If the velocity of the stream is 2 km/hr, the time taken by him to swim to a place 10 km upstream and back is :1). $9\frac{1}{3}$ hr.2). 10 hr.3). 12 hr.4). $8\frac{1}{3}$ hr.
Answer» I am not SURE, MAY be 10 HR. is CORRECT

Discussion

26.	A man rows upstream 36 km and downstream 48 km taking 6 hours each time.The speed of the current is1). 0.5 kmph2). 2 kmph3). 1 kmph4). 1.5 kmph
Answer» option 3 is the CORRECT ANSWER as PER the answer KEY

Discussion

27.	A man rows 40 km upstream in 8 hours and a distancec of 36 km downstream in 6 hours. Then speed of stream is1). 0.5 km/hr2). 1.5 km/hr3). 1 km/hr4). 3 km/hr
Answer» i THINK OPTION 1 is CORRECT

Discussion

28.	A boat goes 40 km upstream in 8 hours and 36 km downstream in 6 hours. The speed of the boat in still water is :1). 6.5 km/hour2). 5.5 km/hour3). 6 km/hour4). 5 km/hour
Answer» 5.5 km/hour

Discussion

29.	A boat travels 24 km upstream in 6 hours and 20 km downstream in 4 hours. Then the speed of boat in still water and the speed of water current are respectively1). 4 kmph and 3 kmph2). 4.5 kmph and 0.5 kmph3). 4 kmph and 2 kmph4). 5 kmph and 2 kmph
Answer» is 4.5 KMPH and 0.5 kmph is the CORRECT ANSWER am i RIGHT

Discussion

30.	The speed of a boat in still water is 6 kmph and the speed of the stream is 1.5 kmph.A man rows to a place at a distance of 22.5 km and comes back to the starting point The total time taken by him is :1). 10 hours2). 4 hours 10 minutes3). 6 hours 10 minutes4). 8 hours
Answer» Its very simple question 8 HOURS is the CORRECT ANSWER.

Discussion

31.	A man row 6 km/h in still water .If the speed of the current is 2 km/h, it takes 3 hours more in upstream than in the downstream for the same distance. The distance is1). 30 km2). 24 km3). 20 km4). 32 km
Answer» 24 KM : - OPTION 2

Discussion

32.	A boat goes 6 km an hour in still water, but takes thrice as much time in going the same distance against the current.The speed of the current (in km/hour) is:1). 42). 53). 34). 2
Answer» HELLO, 4 is CORRECT

Discussion

33.	A swimmer swims from a point A against a current for 5 minutes and then swims backwards in favour of the current for next 5 minutes and comes to the point B. If AB is100metres,the speed of the current (in km per hour) is:1). 0.42). 0.23). 14). 0.6
Answer» OPTION 4 is the RIGHT ANSWER

Discussion

34.	In a fixed time, a boy swims double the distance along the current that he swims against the current. If the speed of the current is 3 km/ hr, the speed of the boy in still water is1). 6 km/hr2). 9 km/hr3). 10 km/hr4). 12 km/hr
Answer» 9 km/hr is the BEST SUITED

Discussion

35.	The current of a stream runs at the rate of 4 km an hour. A boat goes 6 km and comes back to the starting point in 2 hours. The speed of the boat in still water is1). 6 km/hour2). 8 km/hour3). 7.5 km/hour4). 6.8 km/hour
Answer» RIGHT ANSWER is 8 km/hour

Discussion

36.	A boy can swim in still water at a speed of 10 km / hr. If the speed of the current would have been 5 kmph,then the boy could swim 60km1). upstream in 4 hour2). downstream in 12 hours3). upstream in 6 hours4). downstream in 4 hours
Answer» OPTION option 4 is the CORRECT ANSWER

Discussion

37.	A man can row at a speed of $4\frac{1}{2}$ km/hr in still water. If he takes 2 times as long to row a distance upstream as to row the same distance downstream, then, the speed of stream (in km/hr) is1). 12). 1.53). 24). 2.5
Answer» i THINK OPTION 2 is CORRECT

Discussion

38.	A man goes downstream with a boat to some destination and returns upstream to his original place in 5 hours. If the speed of the boat in still water and the stream are 10km/hr and 4 km/ hr respectively, the distance of the destination from the starting place is1). 16 km2). 18 km3). 21 km4). 25 km
Answer» OPTION 3 is the RIGHT ONE

Discussion

39.	A man swims downstream a distance of 15 km in 1 hour. If the speed of the current is 5 km/hour, the time taken by the man to swim the same distance upstream is1). 1 hour 30 minutes2). 45 minutes3). 2 hours 30 minutes4). 3 hours
Answer» OPTION option 4 is the CORRECT ANSWER

Discussion

40.	The speed of a motor-boat is that of the current of water as 36:5. The boat goes along with the current in 5 hours 10 minutes. It will come back in1). 5 hour 50 minutes2). 6 hours3). 6 hours 50 minutes4). 12 hours 10 minutes
Answer» OPTION option 3 is the CORRECT ANSWER

Discussion

41.	A man rows 750 m in 675 seconds against the stream and returns in $7\frac{1}{2}$ minutes. Find his rowing speed in still water.1). 3 kmph2). 4 kmph3). 5 kmph4). 6 kmph
Answer» 5 KMPH

Discussion

42.	A boat takes half time in moving a certain distance downstream than upstream. The ratio of the speed of the boat in still water and that of the current is1). 2:12). 1:23). 4:34). 3:1
Answer» OPTION 4 is the ANSWER

Discussion

43.	A boat covers 12 km upstream and 18 km downstream in 3 hours , while it covers 36 km upstream and 24 km downstream in $6\frac{1}{2}$ hours.What is the speed of the current1). 1.5 km/hr2). 1 km/hr3). 2 km/hr4). 2.5 km/hr
Answer» OPTION 3 is the RIGHT ANSWER

Discussion

44.	A boatman rows 1 km in 5 minutes, along the stream and 6 km in 1 hour against the stream. The speed of the stream is1). 3 kmph2). 6 kmph3). 10 kmph4). 12 kmph
Answer» ANSWER for this QUESTION is 3 KMPH

Discussion

45.	A boat running downstream covers a distance of 20km in 2 hrs while it covers the same distance upstream in 5 hrs. Then speed of the boat in still water is1). 7 km/hr2). 8 km/hr3). 9 km/hr4). 10 km/hr
Answer» 7 km/hr is the ANSWER

Discussion

46.	If a boat goes 100 km downstream in 10 hours and 75 km upstream in 15 hours, then the speed of the stream is1). 2 km/hour2). 2.5 km/hour3). 3 km/hour4). 3.5 km/hour
Answer» ANSWER for this QUESTION is 2.5 km/hour

Discussion

47.	A person can row a distance of one km upstream in ten minutes and downstream in four minutes. What is the speed of the stream 1). 4.5 km/h2). 4 km/h3). 9 km/h4). 5.6 km/h
Answer» I am not SURE, MAY be 4.5 km/h is CORRECT

Discussion

Explore topic-wise InterviewSolutions in .

A motorboat in still water travels at a speed of 36 kmph. It goes 56 km upstream in 1 hour 45 minutes. The time taken by it to cover the same distance down the stream will be :1). 2 hours 25 minutes2). 3 hours3). 1 hour 24 minutes4). 2 hours 21 minutes

A man rows a boat 18 kilometres in 4 hours downstream and returns upstream in 12 hours. The speed of the stream (in km per hour) is :1). 12). 1.53). 24). 1.75

A man rows 750 m in 600 seconds against the stream and returns in $7\frac{1}{2}$ minutes. Its rowing speed in still water is (in km/hr).1). 5.52). 5.753). 54). 5.25

The speed of a boat along the stream is 12 km/h and against the stream is 8 km/h.The time taken by the boat to sail 24 km in still water is1). 2 hours2). 3 hours3). 2.4 hours4). 1.2 hours

A man can row 15km/hr downstream and 9 km/hr upstream. The speed of the boat in still water is1). 8 km/hr.2). 10 km/hr.3). 15 km/hr.4). 12 km/hr.

A man rows down a river 15 km in 3 hrs, with the stream and returns in $7\frac{1}{2}$ hrs. The rate at which he rows in still water is1). 2.5 km/hr2). 1.5 km/hr3). 3.5 km/hr4). 4.5 km/hr

The speed of the current is 5 km/hour. A motorboat goes 10 km upstream and back again to the starting point in 50 minutes. The speed (in km/hour) of the motorboat in still water is1). 202). 263). 254). 28

A man can swim at the rate of 4 km/ hr in still water. If the speed of the water is 2 km / hr, then the time taken by him to swim 10 km upstream is1). $2\frac{1}{2}$ hrs2). $3\frac{1}{2}$ hrs3). 5 hrs4). 4 hrs

A moter boat covers a certain distance downstream in a river in 3 hours.It covers the same distance upstream in 3 hours and a half.If the speed of water is 1.5 km/h,then the speed of the boat in still water is :1). 17 km/h2). 19.5 km/h3). 17.5 km/h4). 19 km/h

A boat covers 24 km upstream and 36 km downstream in 6 hours, while it covers 36 km upstream and 24 km downsteam in $6\frac{1}{2}$ hours. The speed of the current is1). 1 km/hr2). 2 km/hr3). 1.5 km/hr4). 2.5 km/hr

Speed of a boat is 5km per hour in still water and the speed of the stream is 3 km per hour. If the boat takes 3 hours to go to a place and come back, the distance of the place is :1). 3.75 km2). 4 km3). 4.8 km4). 4.25 km

Speed of a boat along and against the current are 12 km/hr and 8 km/hr respectively. Then the speed of the current in km/hr is1). 52). 43). 34). 2

A boat moves downstream at the rate of 1 km in $7\frac{1}{2}$ minutes and upstream at the rate of 5 km an hour.What is the speed of the boat in the still water 1). $3\frac{1}{2}$ km/hour2). $6\frac{1}{2}$ km/hour3). 4 km/hour4). 8 km/hour

A sailor goes 12 km downstream in 48 minutes and returns in 1 hour 20 minutes. The speed of the sailor in still water is :1). 12 km/hr2). 12.5 km/hr3). 13 km/hr4). 15 km/hr

A man can row 30 km downstream and return in a total of 8 hours. If the speed of the boat in still water is four times the speed of the current, then the speed of the current is1). 1 km/hour2). 2 km/hour3). 4 km/hour4). 3 km/hour

A person can row $7\frac{1}{2}$ km an hour in still water and he finds that it takes him twice as long to row up as to row down the river.The speed of the stream is :1). 2 km/hr2). 3 km/hr3). $2\frac{1}{2}$ km/hr4). $3\frac{1}{2}$ km/hr

The speed oi a boat in still water is 10 km/ hr. It covers (upstream) a distance of 45 km in 6 hours. The speed (in km/hr) of the stream is1). 2.52). 33). 3.54). 4s

Speed of motorboat in still water is 45kmph. If the motorboat travels 80 km along the stream in 1 hour 20 minutes, then the time taken by it to cover the same distance against the stream will be1). 3 hours2). 1 hour 20 minutes3). 2 hours 40 minutes4). 2 hours 55 minutes

A man can row at 5 kmph, in still water. If the velocity of current is 1 kmph. and it takes him 1 hour to row to a place and come back, how far is the place 1). 2.5 km2). 3 km3). 2.4 km4). 3.6 km

A boat can travel with a speed of 13 km/hr in still water. If the speed of stream is 4 km/hr in the same direction, time taken by boat to go 63 km in opposite direction is1). 9 hrs2). 4 hrs3). 7 hrs4). $3\frac{9}{17}$ hrs

A boat goes 20 km downstream in one hour and the same distance upstream in two hours. The speed of the boat in still water is1). 15 km/hr.2). 10 km/hr.3). 5 km/hr.4). 7.5 km/hr.

A boat goes 12 km downstream and comes back to the starting point in 3 hours. If the speed of the current is 3 km/ hr, then the speed (in km/ hr) of the boat in still water is1). 122). 93). 84). 6

Two boats A and B start towards each other from two places, 108 km apart. Speed of the boat A and B in still water are 12km/hr and 15km/hr respectively. If A proceeds down and B up the stream ,they will meet after.1). 4.5 hours2). 4 hours3). 5.4 hours4). 6 hours

The speed of a stream is 3 km/hr, and the speed of a man in still water is 5 km/ hr. The time taken by the man to swim 26 km downstream is :1). $8\frac{2}{3}$ hrs.2). $3\frac{1}{4}$ hrs.3). 13 hrs.4). $5\frac{1}{5}$ hrs.

A man can swim 3 km/hr,in still water. If the velocity of the stream is 2 km/hr, the time taken by him to swim to a place 10 km upstream and back is :1). $9\frac{1}{3}$ hr.2). 10 hr.3). 12 hr.4). $8\frac{1}{3}$ hr.

A man rows upstream 36 km and downstream 48 km taking 6 hours each time.The speed of the current is1). 0.5 kmph2). 2 kmph3). 1 kmph4). 1.5 kmph

A man rows 40 km upstream in 8 hours and a distancec of 36 km downstream in 6 hours. Then speed of stream is1). 0.5 km/hr2). 1.5 km/hr3). 1 km/hr4). 3 km/hr

A boat goes 40 km upstream in 8 hours and 36 km downstream in 6 hours. The speed of the boat in still water is :1). 6.5 km/hour2). 5.5 km/hour3). 6 km/hour4). 5 km/hour

A boat travels 24 km upstream in 6 hours and 20 km downstream in 4 hours. Then the speed of boat in still water and the speed of water current are respectively1). 4 kmph and 3 kmph2). 4.5 kmph and 0.5 kmph3). 4 kmph and 2 kmph4). 5 kmph and 2 kmph

The speed of a boat in still water is 6 kmph and the speed of the stream is 1.5 kmph.A man rows to a place at a distance of 22.5 km and comes back to the starting point The total time taken by him is :1). 10 hours2). 4 hours 10 minutes3). 6 hours 10 minutes4). 8 hours

A man row 6 km/h in still water .If the speed of the current is 2 km/h, it takes 3 hours more in upstream than in the downstream for the same distance. The distance is1). 30 km2). 24 km3). 20 km4). 32 km

A boat goes 6 km an hour in still water, but takes thrice as much time in going the same distance against the current.The speed of the current (in km/hour) is:1). 42). 53). 34). 2

A swimmer swims from a point A against a current for 5 minutes and then swims backwards in favour of the current for next 5 minutes and comes to the point B. If AB is100metres,the speed of the current (in km per hour) is:1). 0.42). 0.23). 14). 0.6

In a fixed time, a boy swims double the distance along the current that he swims against the current. If the speed of the current is 3 km/ hr, the speed of the boy in still water is1). 6 km/hr2). 9 km/hr3). 10 km/hr4). 12 km/hr

The current of a stream runs at the rate of 4 km an hour. A boat goes 6 km and comes back to the starting point in 2 hours. The speed of the boat in still water is1). 6 km/hour2). 8 km/hour3). 7.5 km/hour4). 6.8 km/hour

A boy can swim in still water at a speed of 10 km / hr. If the speed of the current would have been 5 kmph,then the boy could swim 60km1). upstream in 4 hour2). downstream in 12 hours3). upstream in 6 hours4). downstream in 4 hours

A man can row at a speed of $4\frac{1}{2}$ km/hr in still water. If he takes 2 times as long to row a distance upstream as to row the same distance downstream, then, the speed of stream (in km/hr) is1). 12). 1.53). 24). 2.5

A man goes downstream with a boat to some destination and returns upstream to his original place in 5 hours. If the speed of the boat in still water and the stream are 10km/hr and 4 km/ hr respectively, the distance of the destination from the starting place is1). 16 km2). 18 km3). 21 km4). 25 km

A man swims downstream a distance of 15 km in 1 hour. If the speed of the current is 5 km/hour, the time taken by the man to swim the same distance upstream is1). 1 hour 30 minutes2). 45 minutes3). 2 hours 30 minutes4). 3 hours

The speed of a motor-boat is that of the current of water as 36:5. The boat goes along with the current in 5 hours 10 minutes. It will come back in1). 5 hour 50 minutes2). 6 hours3). 6 hours 50 minutes4). 12 hours 10 minutes

A man rows 750 m in 675 seconds against the stream and returns in $7\frac{1}{2}$ minutes. Find his rowing speed in still water.1). 3 kmph2). 4 kmph3). 5 kmph4). 6 kmph

A boat takes half time in moving a certain distance downstream than upstream. The ratio of the speed of the boat in still water and that of the current is1). 2:12). 1:23). 4:34). 3:1

A boat covers 12 km upstream and 18 km downstream in 3 hours , while it covers 36 km upstream and 24 km downstream in $6\frac{1}{2}$ hours.What is the speed of the current1). 1.5 km/hr2). 1 km/hr3). 2 km/hr4). 2.5 km/hr

A boatman rows 1 km in 5 minutes, along the stream and 6 km in 1 hour against the stream. The speed of the stream is1). 3 kmph2). 6 kmph3). 10 kmph4). 12 kmph

A boat running downstream covers a distance of 20km in 2 hrs while it covers the same distance upstream in 5 hrs. Then speed of the boat in still water is1). 7 km/hr2). 8 km/hr3). 9 km/hr4). 10 km/hr

If a boat goes 100 km downstream in 10 hours and 75 km upstream in 15 hours, then the speed of the stream is1). 2 km/hour2). 2.5 km/hour3). 3 km/hour4). 3.5 km/hour

A person can row a distance of one km upstream in ten minutes and downstream in four minutes. What is the speed of the stream 1). 4.5 km/h2). 4 km/h3). 9 km/h4). 5.6 km/h