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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

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) 3 (c) 21 (b) 4 (d) 1

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