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  1. Two trains of equal length are running on parallel lines in the same direction at 46 km/h and 36 km/h. The faster train passes, the slower train in 36 seconds. The length of each train is :
    1. 82 m
    2. 50 m
    3. 80 m
    4. 72 m
Correct Option: B

Let the length of each train be x metre.
Relative speed = 46 – 36 = 10 kmph

=
10 × 5
metre/second
18

=
25
metre/second
9

∴  
2x
= 36
(25/9)

⇒  2x =
36 × 25
= 100
9

⇒  x = 50 metre



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