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A man can row upstream at 15 km/h and downstream at 21 km/h. The speed of water current of the river is?

8 km/h
6 km/h
3 km/h
5 km/h

Correct Answer: 3 km/h

Explanation:

Speed of water current =( V_d - V_u)/2
= (21 - 15) /2
= 3 km/h

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