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/h, what is the length of the platform?

120 m
240 m
300 m
None of these

Correct answer: 240 m

Solution

At 54 km/h, the train speed is 15 m/s. In 20 seconds it covers 300 m, which is the train length; in 36 seconds it covers 540 m, so the platform length is 240 m.

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