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A man can row 9 1/3\ kmph in still water...

A man can row `9 1/3\ kmph` in still water and finds that it takes him thrice as much time to row up than as to row down the same distance in the river. The speed of the current is : a. `3 1/3\ k m//h r` b. `3 1/9k m//h r` c. `4 2/3k m//h r` d. `4 1/2k m//h r`

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