100 mtr race, A beats B by 15 mtr, B beats C by 10 mtrs, A beats C by 5 secs, speed of c?

• 4.7 mtrs/sec
  
  100 mtr race, A beats B by 15 mtr,
  means
  when A covers 100m , B covers 85 mtrs
  B beats C by 10 mtrs, when B covers 100 mtrs, C covers 90 m.
  when B covers 85 mtrs, C covers 90*85/100 = 153/2 mtrs
  
  so when A covers 100mtrs, B covers 85 mtrs, C covers 153/2 mtrs.
  It means 100-153/2 = 47/2 mtrs are covers by C in 5 secs
  so speed of C = 47/10 = 4.7 mtrs/sec
  
• 12 years agoHelpfull: Yes(34) No(0)
• speed of c=4.7m/secr
  let speed of a=20v then that of b=17v and solving speed of c=20v/(1+v)
  again b beats c by 10 meter the time in which b travels 100 meter=100/17v
  now [20v/(1+v)]*[100/17v]=90 solve it u will get 20v/(1+v)=4.7
• 12 years agoHelpfull: Yes(2) No(0)
• is the ans 5
• 12 years agoHelpfull: Yes(1) No(8)
• post the options pls...
• 12 years agoHelpfull: Yes(0) No(1)