A train passes by a stationary man standing on the platform in 7 seconds and passes by the platform ...........

Quantitative Aptitude ( CCS) Time & distance

A train passes by a stationary man standing on the platform in 7 seconds and passes by the platform completely in 28 seconds. If the length of the platform is 330 metres, the length of the train is

130 m

125 m

120 m

110 m

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Explanation:

In first case, train travels a distance equal to its length. In second case, train travels
a distance equal to (its length + 330 m).
Therefore, 28−7=2128−7=21 sec is taken to travel 330330 m.
Hence, in 77 seconds, train can travel 3303=1103303=110 m.
=> length of the train =110=110 m