Q: A 120 meter long train crosses a man standing on the platform in 6 sec. What is the speed of the train?
Options:
(A) 229
(B) 108
(C) 278
(D) 72
(E) 112
A: (D)
Explain how we arrive at this answer: 
user
Explanation: S = 120/6 * 18/5 = 72 kmph
assistant