Arithmetic Ability
Problems on Trains

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Q.

An express train takes 4 seconds to enter tunnel which is 1 km long. If it is traveling at 108 km an hour, how long will it take to pass completely through the tunnel ?

View Answer

Correct choice: B

Explanation:

Speed = 108 km/hr enter a tunnel,, means that the train covers a distance equal to its own length so (108 x 5/18) = x/4 where x= length of train hence x = 120 mtrs to pass completely train has to travel a distance = (x + tunnel length) that is 1120 mtrs. so (1120/t) = (108x5/18) t = 37.33 sec
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