Given the following reasoning and answer, what was the question? D = 72 * 5/18 = 40 = 800 â€“ 250 = 450m
 The answer: (A)
The question A train 250 m long running at 72 kmph crosses a platform in 40 sec. What is the length of the platform?
Options:
(A) 450m
(B) 200m
(C) 250m
(D) 270m
(E) 300 m