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All Question-Answers Revision - Question-Bank
Q : A 300 metre long train crosses a platform in 39 seconds while it crosses a post in 18 seconds. What is the length of the platform? Problems on Trains
350 meters
420 meters
150 meters
600 meters

  correct answer :   350 meters

Explanation:- Let length of the platform be x metre ( x + 300 ) : 300 = 39 : 18
⇒ ( x + 300 ) : 300 = 13 : 6
⇒ 6x + 1800 = 3900
⇒ x = 350



Q : A train has a length of 150 metres. It is passing a man who is moving at 2 km/hr in the same direction of the train, in 3 seconds. Find out the speed of the train. Problems on Trains
180 km/hr
182 km/hr
152 km/hr
169 km/hr

  correct answer :   182 km/hr

Explanation:- Length of the train = 150 m
Speed of the man = 2 km/hr
Relative speed = 150/3 = 50 m/s = 50 × 18/5 = 180 km/hr
Relative speed = Speed of train - Speed of the man (as both are moving in the same direction).
Therefore, Speed of the train = Relative speed + Speed of the man = 180 + 2 = 182 km/hr


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