In what time will a train 180 m long cross an electric pole, it its speed be 144 km/hr? Choose the most appropriate option:
A) 2.5 sec B) 1.9 sec C) 8.9 sec D) 4.5 sec E) 2.9 sec

Rationale: "speed = 144 * 5 / 18 = 40 m / sec time taken = 180 / 40 = 4.5 sec . answer : d"
Answer: D