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Question

Two trains of equal length 140 meters are running in opposite directions on parallel tracks at the same speed. If the trains cross each other 14 seconds, find the speed of each train?

  • 24
  • 30
  • 36
  • 42
Answer- C

Let the speed of each train is = X km/hr

Relative speed = X + X = 2X ................. (1)

Also, Relative Speed = Distance/Time

Relative Speed = (140+140)/14 =280/14 =20 m/s ......(2)

From equation (1) and (2)

2X = 20

X= 10 m/s

We need answer in km/hr so, 10 x 18/5 = 36 km/hr