In what time will a train 135 m long cross an electric pole, it its speed be 140 km/hr? Choose the correct answer.
A) 3.5 B) 2.7 C) 2.9 D) 2.3 E) 2.1

Rationale: "speed = 140 * 5 / 18 = 38.8 m / sec time taken = 135 / 38.8 = 3.5 sec . answer : a"
Answer: A