Two trains are running at 40 km/hr and 20 km/hr respectively in the same direction. Fast train completely passes a man sitting in the slower train in 5 seconds. What is the length of the fast train?

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Question: Two trains are running at 40 km/hr and 20 km/hr respectively in the same direction. Fast train completely passes a man sitting in the slower train in 5 seconds. What is the length of the fast train?
[A].

23 m

[B].

23 2 m
9

[C].

27 7 m
9

[D].

29 m

Answer: Option C

Explanation:

Relative speed = (40 – 20) km/hr = 20 x 5 m/sec = 50 m/sec.
18 9
Length of faster train = 50 x 5 m = 250 m = 27 7 m.
9 9 9