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Q.

A man who can swim at the  rate of  2 km/hr (in still river) crosses a river to a point exactly opposite on the other bank by swimming in a direction of 120° to the flow of the water in the river. Find the velocity of the water current in km/hr

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Detailed Solution

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Let speed of current be   u.
 

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For net velocity of man to be normal to river flow.
2cos60°=u 

u=1 km/hr.
 

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