89. 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
✅ The correct answer is option C.
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

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