A train 250 m long running at 72 kmph crosses a platform in 25 sec. What is the length of the platform?
Pick one.
A) 150 m  B) 200 m  C) 250 m  D) 270 m  E) 300 m

Rationale: "d = 72 * 5 / 18 = 25 = 500 – 250 = 250 m answer : c"
Answer: C