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

A boat which has a speed of `5 km// hr ` in steel 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 km h^(-1)`

B

` 3 km h^(-1)`

C

` 4 km h^(-1)`

D

`sqrt(41) km h^(-1)`

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The correct Answer is:

B

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