In a kilometre race, A can give B a start of 100 m or 15 seconds. How long does A take to complete the race?

• 100 m = 15 sec
  1 m = 15/100 sec
  1000 m = 15/100*1000
  =150 sec
  =2min 30 sec
• 13 years agoHelpfull: Yes(38) No(7)
• 100 m = 15 sec
  1 m = 15/100 sec
  1000 m = 15/100*1000
  =150 sec
  =2min 30 sec+ 15 sec(start given by a to b)
  =2min 45 sec
• 13 years agoHelpfull: Yes(19) No(5)
• 135seconds
  
  150-15=135 sec
• 12 years agoHelpfull: Yes(15) No(4)
• A HAS GIVEN B A START OF 100M OR 15 SEC IMPLIES A CAN COVER 100M IN 15 SEC.
  A'S SPEED= 100/15 m/sec( DIST/TIME).
  thus time to cover 1000m = dist/speed= (1000/100)*15 sec=150 seconds.
• 11 years agoHelpfull: Yes(3) No(0)
• 135 sec,
  (v1*t)/(v2*t)=1000/900 ...1,(v1*t)/(v2*t+15)=d/d...2,from eq. 1&2
  t+15/t=1000/900,t=135 sec
• 11 years agoHelpfull: Yes(1) No(2)
• In a 1000 metre race A gives B a start of 100 m or 15 seconds.
  
  This essentially means that B takes 15 seconds to run 100 m.
  
  Therefore, B will take 150 seconds to run the stretch of 1000 metres. (1000 m = 10 times 100 m and therefore the time taken will also be 10 times 15 seconds = 150 seconds).
  
  As A gives B a start of 15 seconds, A obviously takes 15 seconds less than B to complete the race.
  
  Hence, A will take 135 seconds to run the 1000 m.
• 10 years agoHelpfull: Yes(1) No(0)
• for 100m----- 15 sec
  1 m ----?
  = 15/100 =0.15
  so for 1000m it takes 0.15*1000 =150 sec
  so a takes 150+15 sec= 165 sec= 2 min 75 sec
• 12 years agoHelpfull: Yes(0) No(15)
• for 100m----- 15 sec
  1 m ----?
  = 15/100 =0.15
  so for 1000m it takes 0.15*1000 =150 sec
  so a takes 150+15 sec= 165 sec= 2 min 75 sec
• 11 years agoHelpfull: Yes(0) No(4)
• 100m =15 sec
  1km =1000m
  therefore ans is 1000m=150 sec
• 11 years agoHelpfull: Yes(0) No(3)
• 100m=15sec
  1000m=1000*(15/100)
  =150 sec
  =2 min 30 sec
• 9 years agoHelpfull: Yes(0) No(0)
• 100 m = 15 sec
  1 m = 15/100 sec
  1000 m = 15/100*1000
  =150 sec
  =2min 30 sec
  
• 9 years agoHelpfull: Yes(0) No(0)