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 1 train =(diatance÷time):(120÷10)=12m/so Length of 2 train =(speed× time):(12×15)=180m Then, speed of 2 train= (180/15)=12m/s So I think answer will be option - C that is 12.0

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