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A boat travels upstream from B to A and down stream from A to B in 3 hours. If the speed of boat in still water is 9 km/hr. and the speed of current is 3 km/hr the distance between A and B (km) is


A) 4

B) 6

C) 8

D) 12

Correct Answer:
D) 12

Description for Correct answer:
Speed down stream = \( \Large \left(9+3\right) = 12\ km/hr \)

Speed upstream = \( \Large \left(9-3\right) = 6\ km/hr \)

Suppose distance between A and B is x km.

= \( \Large \frac{x}{6}+\frac{x}{12}=3,\ 2x+x = 36\)

3x = 36

x = 12

Part of solved Boat and Stream questions and answers : >> Aptitude >> Boat and Stream




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