Boats and Streams

Quantitative Aptitude (RBI Grade B)

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A boat travels downstream from point A to B and comes back to point C half distance between A and B in 18 hours. If speed of boat is still water is 7 km/hr and distance AB = 80 km, then find the downstream speed.

15 km/hr

18 km/hr

12 km/hr

10 km/hr

Explanation:

Solution:
A to B is 80, so B to is 80/2 = 40 km
Let speed of current = x km/hr
So 80/(7+x) + 40/(7-x) = 18
Solve, x = 3 km/hr
So downstream speed = 7 + 3 = 10 km/hr

By: Pranav Gupta

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