Question

A boat takes 28 hours for travelling downstream from point A to point B and coming back to point C midway between A and
B. If the velocity of the stream is 6km/hr and the speed of the boat in still water is 9 km/hr, what is the distance between A and B? 

A 120 km
B 40 km
C 61 km
D 64 km
E 96 km
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