1.

John and Priya went for a small picnic. After having their lunch Priya insisted to travelin a motor boat. The speed of the motor boat was 20 km/hr. Priya being a Mathematics student wanted to know the speed of the current. So she noted the time for upstream and downstream. She found that for covering the distance of 15 km the boat took 1 hour more for upstream than downstream. What is the speed of current ?

Answer»

20 km/hour
10 km/hour
15 km/hour
25 km/hour

Solution :We have `x^(2) +30x -400 = 0 `
`x^(2) + 40x -10x-400 = 0`
`x(x+40)-10x (x+40) =0`
`(x+40) (x-10) =0`
`x=10, -40`
Here x = 10 is only possible.
Thus (C) is correct OPTION.


Discussion

No Comment Found

Related InterviewSolutions