A train 250 m long running at 72 kmph crosses a platform in 50 sec. What is the length of the platform? Pick.
A) 150 m	B) 200 m	C) 250 m	D) 750 m	E) 300 m

Rationale: "d = 72 * 5 / 18 = 50 = 1000 â € “ 250 = 750 m answer : d"
Answer: D