In what time will a train 140 m long cross an electric pole, it its speed be 108 km/hr?	Choose the correct choice:	A) 2.5	B) 4.7	C) 2.9	D) 2.3	E) 2.1

Rationale: "speed = 108 * 5 / 18 = 30 m / sec time taken = 140 / 30 = 4.7 sec . answer : b"
Answer: B