In what time will a train 300 m long cross an electric pole, it its speed be 144 km/hr? Choose the correct choice from the following choices: A) 2.5 sec B) 9.7 sec C) 3.5 sec D) 2.9 sec E) 7.5 sec

Rationale: "speed = 144 * 5 / 18 = 40 m / sec time taken = 300 / 40 = 7.5 sec . answer : e"
Answer: E