in 8/2/2015 (today) elitmus question
A beats B by 15 meters in 200 meters race.
A beats C by 19 meters in 200 meters race.
how much B beats C in 3700 meters race?

• A=200,B=185
  A=200,C=181
  B:c=185:181
  3700*181/185=80
• 8 years agoHelpfull: Yes(3) No(3)
• we take ratio of speed of a to the speed of b
  let time taken to complete the 200 mtrs be x
  so speed of a= 200/x
  at same time x distance covered by b is 200-15=185
  so we can say speed of b = 185/x
  now,
  x=200/s.a=185/s.b //where s.a is speed of a and s.b is speed of b //
  s.a/s.b=200/185
  similarly
  s.a/s.c=200/181
  s.a=200*s.b/185=200*s.c/181
  s.b/s.c=185/181
  we consider time taken to complete 3700m by b will be 3700/185=20
  in 20min c will cover (181*20) m=3620
  3700-3620=80
  b beats c by 80 m
• 8 years agoHelpfull: Yes(3) No(0)
• sorry guys
  A=200 B=185
  A=200 C=181
  B:C=3700-[(181/185)*3700]=80
• 8 years agoHelpfull: Yes(2) No(0)
• b beats c in 200m race =4 min
  so b will beat c in 100m race =2 min
  so b will beat c in 3700 m race=37*2=74min
• 8 years agoHelpfull: Yes(1) No(2)
• if A,B and C are racing for 3700m then ans will be 74m, but if only B and C are running then B beats C by 80m.
• 8 years agoHelpfull: Yes(1) No(0)
• (1) A=200, B=(200-15=185)
  (2) A=200 C=(200-19=181)
  So B beat C=185-181=4m in 200m race
  in 100m race B beat C=2m
  so in 3700m race race B beat C=2*37/100=74m
• 8 years agoHelpfull: Yes(0) No(1)
• i mark ans 74
  but i think correct is 80
  
  
  
• 8 years agoHelpfull: Yes(0) No(0)
• A = 200 m B= 185 C= 181 (for 200m)
  B is faster so B will Reach first
  185/5 * 100 = 3700
  @ same time
  181/5 * 100 =3620
  hence 3700-3620=80
  
• 8 years agoHelpfull: Yes(0) No(0)
• In 200 meters race a -200 ,b -185 and c 181...
  B beats c by 4 meter in 185 meter race
  Not in 200 meter race
  So ans is (4*3700)/185= 80
• 8 years agoHelpfull: Yes(0) No(0)
• Answer is 80 meters,
  If we consider A won the race is 100 seconds.
  then speed of A will be (from Speed=Dist/Time) 2 m/s.
  Therefore, in 100 seconds B moved 185 meters i.e. speed is 1.85 m/s.
  Similarly, speed of C in 100 seconds will be 1.81 m/s.
  
  Now, if B moves with this speed for 3700 meters, then time taken is;
  3700/1.85 = Time (from Distance/Speed = Time)
  Therefore, Time = 2000 seconds
  
  Now C in 2000 seconds reaches,
  Distance= 1.81*2000
  Distance = 3620
  
  Therefore, C loses to B by, 3700-3620, i.e. 80 metres.
• 8 years agoHelpfull: Yes(0) No(0)