In what time will a train 140 m long cross an electric pole, it its speed be 144 km/hr?	Choose the correct choice from the following answers
A) 3.5 sec B) 4.25 sec C) 5 sec D) 12.5 sec E) 6 sec

Rationale: "speed = 144 * 5 / 18 = 40 m / sec time taken = 140 / 40 = 3.5 sec . answer : a"
Answer: A