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  1. A man can row upstream at 15 km/h and downstream at 21 km/h. The speed of water current of the river is ?
    1. 8 km/h
    2. 6 km/h
    3. 3 km/h
    4. 5 km/h
Correct Option: C

Speed of water current =( Vd - Vu)/2
= (21 - 15) /2
= 3 km/h


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