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A motor boat goes downstream from point A to B ,which is 36 km away from point A, and then returns to
A.If actual speed of the boat in still water is 7km/hour ,and the total upstream and downstream journey takes 21 hours .What must be the actual speed of boat for the journey from A to B to take exactly 108 minutes ?

A 18 km/hr

B 12 km/hr

C 15 km/hr

D 21 km/hr

E 30 km/hr

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