In what time will a train 120 m long cross an electric pole, it its speed be 144 km/hr?
Choose the correct choice.
A) 2.5 sec  B) 3 sec  C) 8.9 sec  D) 6.9 sec  E) 2.9 sec

Rationale: "speed = 144 * 5 / 18 = 40 m / sec time taken = 120 / 40 = 3 sec . answer : b"
Answer: B