A man can swim in still water at a speed of 5kmph. He desires to cross a river flowing at a speed of 4 kmph in the shortest time interval. The direction in which he has to swim is

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making an angle tan–13/4 with the normal to the river flow

making an angle sin–13/4 with the normal to the river flow

making an angle cos–13/4 with the normal to the river flow

making an angle 900 with the river flow

answer is D.

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Detailed Solution

He has to swim normal to flow of water

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