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A train travelling at 54 km/hr crosses a pole in x seconds. The train consists of an engine along with 5 coaches. Length of a train is 180 m. How many coaches are to be removed so that train crosses the pole in x/2 seconds (Assume that the length of the engine is equal to that of coaches)?

A train travelling at 54 km/hr crosses a pole in x seconds. The train consists of an engine along with 5 coaches. Length of a train is 180 m. How many coaches are to be removed so that train crosses the pole in x/2 seconds (Assume that the length of the engine is equal to that of coaches)? Correct Answer 3

Speed of train = 54 km/hr

⇒ 54 × 5/18

= 15 m/s

Length of train = 180 m

Time = length/speed

= 180/15

= 12 s

Engine + 5 coaches take 12 s

For train to be passed in 12/2 = 6 s, Train should have Engine + 2 coaches

⇒ 3 coaches are to be removed

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