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In a steam running at 2 km/h, a motorboa...

In a steam running at 2 km/h, a motorboat goes 10 km upstream and back again to the starting point in 55 min. Find the speed of the motorboat in still water
(A) 22 km/h (B) 32 km/h (c ) 42 km/h (D) 52 km/h

A

B

B

C

C

A

D

D

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