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?

A. 15 kmph

B. 10 kmph

C. 12 kmph

D. 12.5 kmphCorrect Answer

E. None of these

Correct Option: D. 12.5 kmph

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