A train of 24 carriages, each of 60 meters length, when an engine also of 60 meters length is running at a speed of 60 kmph. In what time will the train cross a bridge 4.5 km long?	Choose the correct choice from the following answers: A) 4 B) 3 C) 5 D) 6 E) 9

Rationale: "d = 25 * 60 + 4500 = 6000 m t = 6000 / 60 * 18 / 5 = 360 sec = 6 mins answer : d"
Answer: D