Two trains 200mts and 150mts are running on the parallel rails at this rate of 40km/hr and 45km/hr.In how much time will they cross each other if they are running in the same direction.

• same direction relative spped=45km/hr-40km/hr=5km/hr*5/18=25/18m/s.
  speed=25/18 m/sec.
  distance=200+150=350mts.
  time=350*18/25=252seconds
• 12 years agoHelpfull: Yes(4) No(0)
• 4.2 minutes
  
  The 150m long train is travelling at 5kmph relative speed. It has to travel 200+150 = 350m to completely cross the other.
  Time needed = distance / speed = 350m/5kmph = 4.2 minutes
• 13 years agoHelpfull: Yes(2) No(1)
• 260 seconds.
  
  expalnation:
  Difference in Speed is 5km/h. Menas 5*5/18 = 25/18 mts/sec
  To cross 200mts, at a speed of 25/18 mts/sec takes around 260 seconds
• 13 years agoHelpfull: Yes(0) No(3)