Q. A train overtakes two persons who are walking in the same direction in which the train is going, at the rate of 2 kmph and 4 kmph and passes them completely in 9 and 10 seconds respectively. The length of the train is:

Option
A. 45 m
B. 50 m
C. 54 m
D. 72 m

• Ans)B ( 50)
  from first person we will get the equation
  L = (5/2)(S - 2)
  from the second person we will get the equation
  L = (25/9)(S - 4)
  by solving both the equations S = 22
  from dat L = 50
• 12 years agoHelpfull: Yes(0) No(12)
• Speed of slower person is 2kmph = 0.555555556 m/s
  distance covered in 9 sec = 5m
  Speed of Faster person is 4kmph = 1.111111111 m/s
  distance covered in 10 sec = 11.1111111 m
  speed of train=total distance covered/time
  in case of slower person
  s=d/9
  9s=d
  in case of faster person
  s={d+(11.11111-5)}/10
  comes out
  d=50
  taking out 5 m covered by slower person
  so length of train = 50-5
  =4
  
  Option A
  
• 10 years agoHelpfull: Yes(0) No(0)