Train into a Tunnel
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An express train takes 3 seconds to enter the tunnel which is 1 km long.
If it is travelling at 120 km an hour, how long will it take to pass completely through the tunnel? 
33 Seconds
The train travels at 120 km/h = 120,000m/h
i.e., 120,000 / 3,600 m/s
It ‘takes 3 seconds to enter the tunnel‘ means it takes 3 sec. for the entire length of the train to pass the entrance of the tunnel.
Hence, the length of the train = distance covered kin 3 sec. = 120,000 / 3,600 * 3 = 100m
To completely pass through the tunnel, the total distance to be covered = length of tunnel + length of train = 1100m (1km + 100m)
Since the train takes 3 sec. to cover 100m, time taken to cover the 1,100m = 33 Sec.
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