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Relative Position

Speed of flow...

Question

Speed of flow of water in a river is $3 m / s$ . Speed of man in water is $5 m / s$ . If the man want to cross the river in shortest time, then he has to head

A

Normal to bank of river

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B

37^{\circ}

to the bank of river

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C

53^{\circ}

to the bank of the river

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D

along the bank of the river

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Solution

The correct option is A Normal to bank of river
For shortest time, the man must head normal to the bank of river or normal to the direction of river current.

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