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

1
\(7\frac{1}{2}\:km/h\)
2
\(6\frac{1}{2}\:km/h\)
3
\(5\frac{1}{2}\:km/h\)
4
\(4\frac{1}{2}\:km/h\)

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