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Question

A train 700m long is running at 72 kmph . If it crosses a tunnel in 1 minute, the length of the tunnel is :

A
700m
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B
600m
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C
550m
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D
500m
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Solution

The correct option is D 500m
Length of Train =700m
Length of tunnel =X (let)
Time taken to cross the tunnel =1minute=60sec
Speed =72kmph=72×518=20 m sec.
To cross the tunnel train needs to travel = Length of train + Length of tunnel =700+x
Now,
Speed×Time=Distance
20×60=700+x
x=1200700=500
Length of tunnel =500m

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