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Question

Two trains running in opposite directions at 36kmph and 45kmph cross each other in 20 seconds. If one train is 200m long, the length of the other train is :

A
144m
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B
200m
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C
240m
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D
250m
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Solution

The correct option is D 250m
Let the length of the other train be xm.

Sum of their lengths =(200+x)m

Relative speed =(36+45)kmph=81kmph=(81×518)=452m/sec

200+x452=20

2x=500

x=250

Therefore, the length of the other train is 250m.

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