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The speed of boat is 5 kmh^(-1) in still...

The speed of boat is `5 kmh^(-1)` in still water. It crosses a river of width 1 km along the shortest possible path in 15 min. Then, velocity of river will be

A

`4.5 kmh^(-1)`

B

`4 kmh^(-1)`

C

`.5 kmh^(-1)`

D

`3 kmh^(-1)`

Text Solution

Verified by Experts

The correct Answer is:
D
`upsilon_(b)=(1)/(1//4)=4 kmh^(-1)`

`upsilon_(br)=5 kmh^(-1)`
`therefore upsilon_(r )=upsilon_(br)-upsilon_(b)=3 kmh^(-1)`
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