a man can row upstream at 7 kmph and downstream at 10 kmph. find man's rate st

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Question

a man can row upstream at 7 kmph and downstream at 10 kmph. find man's rate still water and the rate of current.

Options:

A . 4 km/hr and 1 km/hr

B . 8.5 km/hr and 1.5 km/hr

C . 6 km/hr and 2 km/hr

D . 6 km/hr and 3 km/hr

Answer: Option B
Explanation :

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