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Question

Two trains of equal length are running on parallel lines in the same direction at 50 km/hr and 40 km/hr. The faster train passes the slower train in 40 seconds. The length of each train is?

  • 50
  • 55
  • 50.55
  • 55.55
Answer- D

Let the length of each train be x meters.

Then, distance covered = 2x meters.

Relative speed = (50 - 40) km/hr

= 10 x 5/18 m/sec

= 25/9 m/sec

2x/40 = 25/9

18x = 1000

x = 55.55