Question

A boat can cover 66 km upstream and 165 km downstream in 13 hours. Speed of the stream is how much less than the speed of the boat in still water if the boat can cover 55 km upstream and 110 km downstream in 9 hours?

A 11 km/h
B 16 km/h
C 18 km/h
D 15 km/h
E None of these
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