Question

A boat can cover 84 km upstream and 252 km downstream in 14 hours. Speed of the stream is how much less than the speed of the boat in still water if the boat can cover 63 km upstream and 189 km downstream in 10 hours?

A 11 km/h
B 16 km/h
C 18 km/h
D 14 km/h
E None of these
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