A 270 meter long train running at the speed of 120 kmph crosses another train running in the opposite direction at the speed of 80 kmph in 9 seconds.What is the lenght of other train.

• Relative speeds=(120+80)km/hr
  =200km/hr=(200*5/18)m/s=(500/9)m/s
  let length of train be xm
  x+270/9=500/9
  x=230
  Ans is 230m
• 9 years agoHelpfull: Yes(10) No(0)
• :-(120+80)*(5/18)=(270+x)/9
  :-500=270+x
  :-x=230
• 9 years agoHelpfull: Yes(1) No(0)
• distance d=length of train1+train2=270+x
  speed s=two are in oppsite so t1+t2=120+80=200kmph=200*(5/18)m/s
  t=d/s;
  9=270+x/(200*(5/18))
  x+270=500
  x=230
• 9 years agoHelpfull: Yes(1) No(0)
• -->unknown train length=x
  -->convert kmps into mps
  Equation:-
  9=(x+270)/((100/3)+(200/9))
  x=230.
  Therefore length of other train=230m
• 9 years agoHelpfull: Yes(0) No(0)
• Time=Distance/speed
  length of second train=x
  9=(270+x)/((120+80)*(5/18))
  X=230mts
• 9 years agoHelpfull: Yes(0) No(0)