A is thrice as good as workman as B and therefore is able to finish a job in 60 days less than B. Working together, they can do it in:

• if A can finish a work = x days, B will do this work = 3x days
  from question A-B= 3x-x = 60, x=30
  A = 30 days , B= 90 days
  A's 1 day work + B's 1 day work = 1/30 + 1/90 = 4/90
  So A and B working together can complete work= 90/4
  = 22.5 days (answer)
• 11 years agoHelpfull: Yes(8) No(0)
• A=B/3
  A=B-60
  B/3=B-60
  B=3B-180
  B=90
  A=30
  
  both
  90/4 =22.5days
• 11 years agoHelpfull: Yes(3) No(2)