A takes twice as much time as B or thrice as much time to finish a piece of work.Working together they can finish the work in 2 days.B can do the work alone in:

• Let B takes =x hours
  A takes=x/2
  1/x + 1/(x/2)=1/2
  3/x=1/2
  x = 6 hours
• 10 years agoHelpfull: Yes(0) No(1)
• A:B=2:1 days
  2x for A
  x for B
  
  Together
  x.2x/x+2x=2x.x/3x=2days
  2x(square)=6x
  2x2-6x=0
  x2-3x=0
  x(x-3)=0 so x=0 or x=3
  days are not 0
  so x=3
  B can do the work alone in 3 days
  
• 10 years agoHelpfull: Yes(0) No(0)