A train running at the speed of 72 km/hr crosses a pole in 9 sec. What is the length of the train?  Choose the correct choice from the following answers
A) 288  B) 279  C) 277  D) 272  E) 180

Rationale: "speed = 72 * 5 / 18 = 20 m / sec length of the train = speed * time = 20 * 9 = 180 m answer : e"
Answer: E