Home » Aptitude » Speed, Time and Distance » Question
  1. How much time does a train, 50 m long, moving at 68 km/ hour take to pass another train, 75 m long, moving at 50 km/hour in the same direction ?
    1. 5 seconds
    2. 10 seconds
    3. 20 seconds
    4. 25 seconds
Correct Option: D

Both trains are moving in the same direction.
∴  Their relative speed
= (68 – 50) kmph = 18 kmph

= 18 ×
5
= 5 m/sec
8

Total length = 50 + 75 = 125 m
∴   Required time =
Total length
Relative speed

=
125
= 25 seconds.
5


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