Aptitude

Topic: Trains

A train speeds past a pole in 15 seconds and a platform 100 m long in 25 seconds. Its length is:A.50 m B.150 mC.200 m D.Data inadequate

Let the length of the train be x metres and its speed by y m/sec.Then,x= 15 y (x +100)/25 = x/1515(x + 100) = 25x15x + 1500 = 25x1500 = 10xx = 150 m.

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