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A boat which has a speed of 5 km// hr ...

A boat which has a speed of `5 km// hr ` in still water crosses a river of width ` 1 km` along the shortest possible path in `15 minutes`. The velocity of the river water in ` km// hr` is

A

`1`

B

`3`

C

`4`

D

`sqrt(41)`

Text Solution

Verified by Experts

The correct Answer is:
B
`t=d/(sqrt(v^(2)-u^(2)))`

`implies 15/60=1/(sqrt(5^(2)-u^(2))) implies u=3km//h`
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