a man rows his boat 85 km downstream and 45 km upstream, taking 2 1/2 hours ea

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a man rows his boat 85 km downstream and 45 km upstream, taking 2 1/2 hours each time. find the speed of the stream?

Options:

A . 5 kmph

B . 6 kmph

C . 7 kmph

D . 8 kmph

Answer: Option D
Explanation :

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