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A man wishes to cross a river perpendicu...

A man wishes to cross a river perpendicularly. In still water he takes 4 minutes to cross the river, but in flowing river he takes 5 minutes. If the river 100 metres wide, the velocity of the flowing water of the river is a. 10m/min. b. 15m/min. c. 20m/min. d. 30m/min.

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