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Question

Two train 126 m and 114 m long are running opposite directions, one at the rate of 30 kmph another one at 42 kmph. From the moments they will cross each other in

A
10 sec
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B
11 sec
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C
12 sec
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D
13 sec
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Solution

The correct option is C 12 sec
Relative speed=(30+42)kmph=72 kmph=(72×518)m/sec=20 m/secDistance covered in crossing each other=(126+114)m=240 m.Required time=(24020)sec=12 sec.

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