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A boat which has a speed of 5 km per hou...

A boat which has a speed of `5 km` per hour in still water crosses a river of width 1 km along the shortest possible path in fifteen minutes. The velocity of the river water in km per hour is :-

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A, C, D
Area of the curve gives distance.
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ALLEN -MOTION IN A PALNE-EXERCISE-02
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