a man can row 18 mph in still water it takes him thrice as long to row up as t

Question

a man can row 18 mph in still water it takes him thrice as long to row up as to row down the river . find the rate of stream.

Options:

A . 9 km/hr

B . 10 km/hr

C . 11 km/hr

D . 12 km/hr

Answer: Option A
Explanation :

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