in a stream running at 2 kmph, a motor boat goes 10 km upstream and back again

Question

in a stream running at 2 kmph, a motor boat goes 10 km upstream and back again to the starting point in 55 minutes. find the speed of motor boat in still water?

Options:

A . 18 kmph

B . 22 kmph

C . 16 kmph

D . 20 kmph

Answer: Option B
Explanation :

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