A train of 24 carriages, each of 60 meters length, when an engine also of 60 me

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Question

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 1.5 km long?

Options:

A . 1 ½ mins

B . 3 mins

C . 3 ½ mins

D . 7 mins

Answer: Option B

D =
25 * 60 + 1500 = 3000 m

T =
3000/60 * 18/5 = 180 sec = 3 mins

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