For this chain-of-thought reasoning and answer, what was the question?
D = 72 * 5/18 = 50 = 1000 250 = 750m
A: (D)
Q: A train 250 m long running at 72 kmph crosses a platform in 50 sec. What is the length of the platform?
Options:
(A) 150m
(B) 200m
(C) 250m
(D) 750m
(E) 300 m