A train 250 m long running at 72 kmph crosses a platform in 15 sec. What is the length of the platform? Select the correct option.
A) 50 m
B) 200 m
C) 250 m
D) 270 m
E) 300 m

Rationale: "d = 72 * 5 / 18 = 15 = 300 â € “ 250 = 50 m answer : a"
Answer: A