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1. A train overtakes two persons who are walking in the same direction in which the train is going, at the rate of 2 kmph and 4 kmph and passes them completely in 9 and 10 seconds respectively. The length of the train is:
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- By: guest on 01 Jun 2017 05.48 pm2 kmph = 2 x 5 m/sec = 5 m/sec. 18 9 4 kmph = 4 x 5 m/sec = 10 m/sec. 18 9 Let the length of the train be x metres and its speed by y m/sec. Then, x = 9 and x = 10. y - 5 9 y - 10 9 9y - 5 = x and 10(9y - 10) = 9x 9y - x = 5 and 90y - 9x = 100. On solving, we get: x = 50. Length of the train is 50 m.
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