1.

What is the speed of boat? (A) Sum of time taken by a boat in upstream and downstream is 18 hours to cover distance 180 km in each. (B) Speed of boat in downstream is 30 km/ h. (C ) Boat cover 90 km in 7 hr, while rowing in upstreamA. Either A and B or B and C are sufficient to answer the questionB. Either A and B or A and C are sufficient to answer the questionC. Either A and C or B and C are sufficient to answer the questionD. Any two statements are sufficient to answer the question

Answer» Correct Answer - D
Let speed of boat ans stream be x and and y respectively
`(A)to (180)/((x+y))+(180)/((x-y))=18`
`(B) to x+y=30km//hr`
`(C) to x-y=90/7km//hr`
By using any two statements we can given answer.


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