A 400 meter long train crosses a man standing on the platform in 10 sec. What is the speed of the train?\nOptions:\n(A) 144\n(B) 108\n(C) 278\n(D) 126\n(E) 112
Reason slowly and give your answer.
(A)
S = 400/10 * 18/5 = 144 kmph.

Therefore, the answer is (A)