A train 280 m long can cross an electric pole in 20 sec and then find the speed of the train?
Choose the correct choice from the following answers:
A) 88 kmph  B) 89 kmph  C) 72 kmph  D) 50 kmph  E) 18 kmph

Rationale: "length = speed * time speed = l / t s = 280 / 20 s = 14 m / sec speed = 14 * 18 / 5 ( to convert m / sec in to kmph multiply by 18 / 5 ) speed = 50 kmph answer : d"
Answer: D