Trains Boats and Streams Practice Test 2 with solutions

Question : 20 of 40

Marks: +1, -0

A train travelling with the uniform speed crosses two bridges of lengths 300 m and 240 m in 21 seconds and 18 seconds respectively, the speed of the train is:

72 km/hr
68 km/hr
65 km/hr
60 km/hr

Validate

Solution:

Difference between the length of the two bridges = 300 - 240 = 60 cm
Difference between their time = 21 - 18 = 3 seconds
Speed =

d/t

{60}/3

= 20 m/sec
=

20 × {18}/5

= 72 km/hours.

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