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

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

=
10 × 5
m./sec.
18

=
25
m./sec.
9

∴ 
2x
= 36
25
9

∴  2x = 36 ×
25
= 100
9

⇒  x =
100
= 50 metre
2



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