In what time will a train 100 meters long cross an electric pole, if its speed is 180 km/hr	Choose the correct choice from the following answers.
A) 5 seconds B) 4.5 seconds C) 3 seconds D) 2 seconds E) none of these

Rationale: "explanation : first convert speed into m / sec speed = 180 * ( 5 / 18 ) = 50 m / sec time = distance / speed = 100 / 50 = 2 seconds answer : d"
Answer: D