In what time will a train 20 m long cross an electric pole, it its speed be 144 km/hr?	Answers
A) 2.5 sec
B) 2.8 sec
C) 0.5 sec
D) 2.3 sec
E) 1.5 sec

Rationale: "speed = 144 * 5 / 18 = 40 m / sec time taken = 20 / 40 = 0.5 sec . answer : c"
Answer: C