A train 180 m long running at 70 kmph crosses a platform in 20 sec. What is the length of the platform? Choose one:
A) 208  B) 277  C) 350  D) 881  E) 271

Rationale: "d = 70 * 5 / 18 = 20 = 388 – 180 = 208 answer : a"
Answer: A