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

Speed of the first train = length/time = 120/10 = 12m/s
Speed of the second train = length/time = 150/15 = 10m/s
2.0 m/s is the difference in the train speed.
 

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