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A boat which has a speed of 5 km per hou...

A boat which has a speed of `5 km` per hour in still water crosses a river of width 1 km along the shortest possible path in fifteen minutes. The velocity of the river water in km per hour is :-

A

`1`

B

`3`

C

`4`

D

`sqrt(41)`

Text Solution

Verified by Experts

The correct Answer is:
B
`V_(R ) = (1Km)/((1)/(4)h) = 4Km//h`
`V_(r) = sqrt(u_(B)^(2) -V_(R)^(2))`
`V_(r) = sqrt(5^(2)-4^(2)) = 3Km//h`
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