Two boats A and B start towards each other from two places 108 km apart Speed of the boat A and B in...........

Quantitative Aptitude ( CCS) Boats and Streams

Two boats A and B start towards each other from two places, 108 km apart. Speed of the boat A and B in still water are 12 km/hr and 15 km/ hr respectively. If A proceeds down and B up the stream, they will meet after ?

4.5 hours

4 hours

5.4 hours

6 hours

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Explanation:

Let the speed of stream = y km/h
Since Boat is moving downstream with 12 km/h
Speed of boat A = (12 + y) km/h
Since Boat is moving upstream with 15 km/h
Speed of Boat B = (15 - y) km/h
thus, Both the boats are moving in opposite direction,
Relative speed of A and B
= 12 + y + 15 – y = 27 km/h
Time = Distance / Relative Speed = 108/27 = 4 hours

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