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

A man can row upstream at 15 km/h and downstream at 21 km/h. The speed

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 ?
A.	8 km/h
B.	6 km/h
C.	3 km/h
D.	5 km/h
Answer» D. 5 km/h

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