Two trains with Length 150mts and 100mts are running on the parallel tracks at the rate of 40km/hr and 45km/hr. In how much time will they cross each other if they are running in the same direction?
option
A. 190 Minutes
B. 200 Minutes
C. 220 Minutes
D. None Of These

• Relative speed of both train running in same direction = (45-40)km/hr
  = 5 km/hr
  convert km/hr to m/s = (5*5/18)m/s
  = 25/18 m/s
  time taken to cross each other is T= Distance/speed
  = (150+100)mts/(25/18)m/s
  = (250*18/25)sec
  = 180 sec
  so,ans= D
• 10 years agoHelpfull: Yes(3) No(0)
• if they started at same place the answer would be 220.
• 10 years agoHelpfull: Yes(0) No(2)
• one train cross the other train after t units
  means, t units, 2nd train (which is having high speed) cross the distance = distance crossed by 1st training + length of 1st train.
  ie. (40 * t)+150 = 45*t
  ie. t = 30
  My answer is D.
• 10 years agoHelpfull: Yes(0) No(1)