Q. In a 500 m race, Ravi beats Ramesh by 5 seconds or 100 m. They decide to run another race and this time Ravi gives Ramesh a head tart of 200 m. If Ravi’s speed is twice his previous speed and Ramesh’s speed is one and half times his previous speed, how far from the starting point should the winning post be so that they finish at the same time?
Option
A) 500 m
B) 1000 m
C) 1500 m
D) 2000 m

• Ans will be 500 m
  Explanation:
  Ravi beats ramesh by 5 sec or 100 mtr....means ramesh cover 100mtr in 5 sec....by this we can get ramesh speed in 20m/sec
  20.............in 1 sec
  500........in 500/20=25 sec(Ramesh's time)
  
  so ravi take 20 sec to cover 500 mtr......by this we can get that ravis speed is 25m/sec
  
  now assume x be the distance from staring line where we need to put the winning post.
  According to question ravi’s speed will be 25*2=50m/sec & ramesh’s speed will be 20*1.5=30 m/sec
  
  now assume x be the distance from staring line where we need to put the winning post.
  
  they will take same time to reach the wining post.
  As ravi gives Ramesh a 200 m ahead start so he has to accede x meter and Ramesh has to accede (x-200) meter
  Hence we may write,
  x/50=(x-200)/30
  x=500 meter
  
• 10 years agoHelpfull: Yes(25) No(0)
• It is already given in the question,the race is for 500 m,then y this much calculation bro!!!!
• 10 years agoHelpfull: Yes(5) No(4)
• from 1st ravi speed=25m/sec
  ramesh speed=20m/sec
  after changes ravi speed=50m/sec
  after changes ramesh speed=30m/sec
  now for ramesh=500-200=300
  and for ravi=500
  so they will complete in 10 second as same remain distance
  
• 10 years agoHelpfull: Yes(2) No(0)
• Rvi beats ramesh by 5 sec or 100 mtr....means ramesh cover 100mtr in 5 sec....by this we can get ramesh speed in 1200mtr/min.....
  1200.............in 60 sec
  1..........in 60/1200 sec
  500........in 60*500/1200=25 sec(Ramesh's time)
  
  so ravi take 20 sec to cover 500 mtr......by this we can get that ravis speed is 1500mtr/min
  
  now assume x be the distance from staring line where we need to put the winning post.
  X/1200=(X+200)/1500 **ravi gives ramesh a 200 mtr head start**
  by solving this we get X=800
  so ans is 800+200=1000 ans
• 10 years agoHelpfull: Yes(0) No(3)
• Ravi beats Ramesh by 5 seconds or 100 m. It means,
  Ramesh goes 100 mtr in 5 sec. nd 500 mtr in 25sec.
  
  Implies that, Ravi goes 500m in 20 sec.
  
  Let, the distance b/w the starting point nd finishing point is 'x'm.
  
  Now, the equation is-
  
  x/25=(x+200)/20
  => x= 1000m.
  
  
  
  
• 10 years agoHelpfull: Yes(0) No(2)