A man is standing on a platform which is 180 m long He finds that a train crosses the brid...........

Quantitative Aptitude (CDS) Problems on trains

A man is standing on a platform which is 180 m long. He finds that a train crosses the bridge in 20 seconds but himself in 8 seconds. Find the speed of the train?

45kmph

58kmph

54kmph

64kmph

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Explanation:

Let the lenght of the train be x meters.
the train covers x meters in 8 secods and (x+180) meters in 120 seconds. Then,
x/8 = (x+180)/20 = 20x = 8 (x+180) x = 120
Length of the train = 120,
now, speed = 120/8 m/sec
= 15m/sec
= 15×18/5 kmph = 54 kmph