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Problems on Trains - General Aptitude

Q1:

A train passes a station platform in 36 seconds and a man standing on the platform in 20 seconds. If the speed of the train is 54 km/hr, what is the length of the platform?

A 120 m

B 240 m

C 300 m

D None of these

ANS:B - 240 m

 
Speed = 54 x 5 m/sec = 15 m/sec.
18
Length of the train = (15 x 20)m = 300 m. Let the length of the platform be x metres.
Then, x + 300 = 15
36
x + 300 = 540 x = 240 m.