In what time will a train 140 meters long cross an electric pole, if its speed is 210 km/hr
Choose the correct choice from the following choices.
A) 5 seconds  B) 4.5 seconds  C) 3 seconds  D) 2.4 seconds  E) none of these

Rationale: "explanation : first convert speed into m / sec speed = 210 * ( 5 / 18 ) = 58 m / sec time = distance / speed = 140 / 58 = 2.4 seconds option d"
Answer: D