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A train 800 metres long is running at a speed of 78 km/hr. If it crosses a tunnel in 1 minute, then the length of the tunnel (in meters) is:

Correct Answer: 500

Explanation:

Speed = 78 x 5 m/sec = 65 m/sec.
18 3


Time = 1 minute = 60 seconds.


Let the length of the tunnel be x metres.



Then, 800 + x = 65
60 3


⟹ 3(800 + x) = 3900


x = 500.


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