A train 1600 m long can cross a pole in 40 sec and then find the speed of the train?  Choose the correct answer
A) 140  B) 142  C) 144  D) 146  E) 148

Rationale: "length = speed * time speed = l / t s = 1600 / 40 s = 40 m / sec speed = 40 * 18 / 5 ( to convert m / sec in to kmph multiply by 18 / 5 ) speed = 144 kmph answer : c"
Answer: C