A train has a length of 150 meters . it is passing a man who is moving at 2 km/hr in the same direction of the train, in 3 seconds. Find out the speed of the train.

Options
1) 182 km/hr
2) 180 km/hr
3) 152 km/hr
4) 169 km/hr

• ans : 182 km/hr
  reltaive velocity equation is
  time(T)=total distance/relative velocity;
  let velocity of train is Vt
  so here both train and man moving in same direction
  so realtive velocity would be (V)=Vt-2
  all parameter convert in km and hour
  total distance (D)=150/1000 km
  total time (T)= 3/60*60 hour
  therefore
  =>3/60*60 = 150/10008(Vt-2)
  after solving above equation ,we get
  Vt=182 km/hr
  check it, Am i correct
• 8 years agoHelpfull: Yes(6) No(0)
• speed of man=2*(5/18)=5/9 m/s
  so, 3=150/s-(5/9)
  s-(5/9)=50
  s=50+(5/9)=500/9 m/s
  =(500/9)*(18/5)
  =200 km/h is the speed of train
• 8 years agoHelpfull: Yes(1) No(3)
• 182 km/hr is the correct answer of this question.
• 8 years agoHelpfull: Yes(0) No(0)
• according to formula [d/(x-x1) = t ]where "d" is the distance, "x "is the speed of train, "x1" is the speed of moving boy (same direction that's why -ve sign concept of relative speed, if the boy moving in the opposite direction put+ve sign instead of -ve), t is the time. put the value in the formula and get the answer.
• 8 years agoHelpfull: Yes(0) No(0)