Trains Boats and Streams Practice Test 3 with solutions

Question : 15 of 40

Marks: +1, -0

A man takes 1 hour 20 minutes to row a boat 16 km downstream and takes 1 hour to cover 3 km upstream. Find the rate of speed of the man in the still water.

10 km/hour
7.5 km/hour
9 km/hour
12.33 km/hour
None of these

Validate

Solution:

Speed downstream =

{16}/{1+{20}/{60}}

16 × 3/4

= 12 km/hour
Speed upstream =

3/1

= 3 km/hour
Rate in still water =

{a+b}/2

{12+3}/2

= 7.5 km/hour

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