Department of Training & Placement
1.
A is 2
1
⁄
3
times as fast as B. If A gives B a start of 80 m, how long should the race
course be so that both of them reach at the same time?
A. 170 metre
B. 150 metre
C. 140 metre
D. 160 metre

• B=X say
  A=7/3(X)as per given
  B already reached 80 meters
  by apply formula:
  s1/s2=d1/d2
  s1=7x/3,s2=x,d1=80+d,d2=d
  by solving this
  we get d=60
  total distance=80+60
  140=ans
  
  
• 10 years agoHelpfull: Yes(7) No(0)
• ratio of speeds of A and B is 7:3
  let distance be x metres.
  then time taken by A to cover x metres is same a time taken by B to cover (x-80) metres
  So, x/7=(x-80)/3
  solving this,
  x=140
• 10 years agoHelpfull: Yes(4) No(0)
• 140 m ans d
• 10 years agoHelpfull: Yes(0) No(2)
• ans is (c)
• 10 years agoHelpfull: Yes(0) No(0)