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A swimmer wants to cross a river which is flowing at a speed ' $v$ '. If the swimmer can swim in still water at speed ' $\mathrm{V}$ ', the direction he should swim to cross the river in least time is
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The correct answer is:
Perpendicular to the flow of river
If the swimmer wants to cross the river in least time than he must swim perpendicular to the flow of the river.
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