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Q.

 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 is _________kmph.

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answer is 3.

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Detailed Solution

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Velocity of Swimmer wrt to ground, vS=width of rivertime taken=114=4km/hr

Velocity of river, vR=vSR2-vS2=3km/hr

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