A train 500 m long can cross an electric pole in 10 sec and then find the speed of the train?  Choose the most appropriate option:  A) 140  B) 150  C) 160  D) 170  E) 180

Rationale: "length = speed * time speed = l / t s = 500 / 10 s = 50 m / sec speed = 50 * 18 / 5 ( to convert m / sec in to kmph multiply by 18 / 5 ) speed = 180 kmph answer : e"
Answer: E