It takes 10 s and 15 s, respectively, for two trains travelling at different constant speeds to completely pass a telegraph post. The length of the first train is 120 m and that of the second train is

(A) 2.0 (B) 10.0 (C) 12.0 (D) 22.0

Your Answer

here we assume that bith of the train is having same length so that distance for crosing make constant..therfore, for 1st train speed is 120/12 =10 m/sec.. for second train 120/15=8m/s so the difference on that speed is 10-8=2m/sec

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