Trains Boats and Streams Practice Test 3 with solutions

Question : 16 of 40

Marks: +1, -0

A motorboat goes 30 km/hour in the still water. If the rate of current is 15 km/hour, it takes 225 minutes to go to a place and come back. How far is the place?

40 km
41 km
42.18 km
44 km
45.76 km

Validate

Solution:

Downstream rate = 30 + 15 = 45 km/hour
Upstream rate = 30 - 15 = 15 km/hour
Let the distance = x km

x/{45}+x/{15}

{225}/{60}

{4x}/{45}

{225}/{60}

x =

{225}/{60} × {45}/4

= 42.18 km.

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