Boats and Streams

Quantitative Aptitude (CHSL)

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A boat running downstream covers a distance of 40km in 4hrs and covering the same distance upstream in 8hrs. What is the speed of a boat in still water.

6km/hr

7km/hr

7.5km/hr

8.5km/hr

Explanation:

Solution:
Downstream speed=40/4=10km/hr
Upstream speed=40/8=5km/hr
So speed of boat in still water=(10+5)/2=15/2
=7.5km/hr

By: Pranav Gupta

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