a man swims downstream 30 km and upstream 18 km taking 3 hours each time, what

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a man swims downstream 30 km and upstream 18 km taking 3 hours each time, what is the speed of the man in still water?

Options:

A . 2 kmph

B . 8 kmph

C . 16 kmph

D . 4 kmph

Answer: Option B
Explanation :

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