Two trains are running at 40 kmph and 20 kmph respectively in the same direction.Fast train completely passes a man sitting in the slower train in 5 seconds.What is the length of the fast trian?
a)23 m b)23 2/9 m c)27m d)27 7/9m

• Option D
  
  relative speed=20kmph=50/9m/sec
  length of the train=50/9*5=250/9=27 7/9m
• 12 years agoHelpfull: Yes(0) No(0)
• LENGTH=speed*time
  speed =relative speeed= 40-20=20 kmph=50/9 mps( as both the trains are in the same direction)
  thus length=27(7/9) m
• 11 years agoHelpfull: Yes(0) No(0)
• Option D
  
  relative speed=20kmph=50/9m/sec
  length of the train=50/9*5=250/9=27 7/9m
• 5 years agoHelpfull: Yes(0) No(0)