In what time will a train 600 meters long cross an electric pole, if its speed is 144 km/hr	Pick one.
A) 5 seconds B) 4.5 seconds C) 3 seconds D) 15 seconds E) none of these

Rationale: "explanation : first convert speed into m / sec speed = 144 * ( 5 / 18 ) = 40 m / sec time = distance / speed = 600 / 40 = 15 seconds answer : d"
Answer: D