Multiple choice

Two trains, 125 metres and 115 metres in length, are running towards each other on parallel lines, one at the rate of 33 km/hr. and the other at 39 km/hr. How much time (in second) will they take to pass each other from the moment they meet?

  1. 8

  2. 10

  3. 12

  4. 15

  5. None of these

Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

When trains move toward each other, their relative speed is the sum: 33 + 39 = 72 km/hr. Convert to m/s: 72 × (5/18) = 20 m/s. Total distance to cover = sum of lengths = 125 + 115 = 240 m. Time = Distance/Speed = 240/20 = 12 seconds.