A man can row 9 1/3 km/hr in still water and he finds that is thrice as much time to row u p than as to row down the same distance in river. The speed of the current is:________?

A. 3 1/9 km/hr

B. 3 1/3 km/hr

C. 1 km/hr

D. 4 2/3 km/hr
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