a man can row 30 km downstream and 20 km upstream in 4 hours. he can row 45 km

Question

a man can row 30 km downstream and 20 km upstream in 4 hours. he can row 45 km downstream and 40 km upstream in 7 hours. find the speed of man in still water?

Options:

A . 15 kmph

B . 10 kmph

C . 12 kmph

D . 12.5 kmph

Answer: Option D
Explanation :

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