A man rows upstream a distance of 9 km or downstream a distance of 18 km taking 3 hours each time. The speed of the boat in still water is

A man rows upstream a distance of 9 km or downstream a distance of 18

1.	A man rows upstream a distance of 9 km or downstream a distance of 18 km taking 3 hours each time. The speed of the boat in still water is
A.	\(7\frac{1}{2}\:km/h\)
B.	\(6\frac{1}{2}\:km/h\)
C.	\(5\frac{1}{2}\:km/h\)
D.	\(4\frac{1}{2}\:km/h\)
Answer» E.

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A man rows upstream a distance of 9 km or downstream a distance of 18 km taking 3 hours each time. The speed of the boat in still water is

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