Trains Boats and Streams Practice Test 3 with solutions

Question : 3 of 40

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A man can row 4 km upstream in 2 hours and 2 km downstream in 20 minutes. How long will it take him to go 8 km in a stagnant water.

Solution:

Downstream rate =

{2×60}/{20}

= 6 km/hour
Upstream rate =

4/2

= 2 km/hour
Rate of current =

{6-2}/{2}

= 2 km/hour
Speed of the boat = 6 - 2 = 4 km/hour
Time taken to cover 8 km in the still water =

8/4

= 2 hour

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