In what time will a train 100 meters long cross an electric pole, if its speed is 72 km/hr  Select the correct option:  A) 5 seconds  B) 2.8 seconds  C) 3.5 seconds  D) 2.5 seconds  E) 2.6 seconds

Rationale: "first convert speed into m / sec speed = 72 * ( 5 / 18 ) = 20 m / sec time = distance / speed = 100 / 20 = 5 seconds answer : a"
Answer: A