A train 400 m long can cross an electric pole in 20 sec and then find the speed of the train?  Answers.
A) 87 kmph	B) 28 kmph	C) 72 kmph	D) 18 kmph	E) 29 kmph

Rationale: "length = speed * time speed = l / t s = 400 / 20 s = 20 m / sec speed = 20 * 18 / 5 ( to convert m / sec in to kmph multiply by 18 / 5 ) speed = 72 kmph answer : c"
Answer: C