A boat having a speed of 5km//hr. in sti...

A boat having a speed of `5km//hr`. in still water, crosses a river of width `1km` along the shortest possible path in `15` minutes. The speed of the river in `Km//hr.`

A

`1km//h`

B

`3km//h`

C

`4km//h`

D

`5km//h`

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The correct Answer is:

B

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