A boat travels upstream from B to A and downstream from A to B in 3 hours. If the speed of the boat in still water is 9 km/h and the speed of the current is 3 km/h, find the distance between A and B in kilometres.

(a) 10 km

(b) 12 km

(c) 14 km

(d) 16 km

(e) None of these

Ans.(b)

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