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Crossing the River(Minimum Time)

Water in a ri...

Question

Water in a river flows from west to east at 4kmph. A man on the north bank capable of swimming at kmph crossed the river in the shortest possible time. Then he should swim along

A

north

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B

south

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C

30^{\circ}

west of north

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D

30^{\circ}

east of north

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Solution

The correct option is B south
For shortest possible time he should make perpendicular strokes
Hence, he should swim towards south
Hence, the option $B$ is the correct answer.

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