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A boat which has a speed of 5 kilometre per hour 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 kilometre per hour is:

A boat which has a speed of 5 kilometre per hour 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 kilometre per hour is:

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