A train 150 m long running at 72 kmph crosses a platform in 20 sec. What is the length of the platform? Choose the most appropriate option.
A) 443 m  B) 354 m  C) 450 m  D) 350 m  E) 250 m

Rationale: "e 250 e = 72 * 5 / 18 = 20 = 400 â € “ 150 = 250"
Answer: E