Jim can type a 20 page document in 40 minutes, Sus can type it in 30 minutes, and Jack can type it in 24 minutes. Working together, how much time willit take to type the same document?
First, find the rates that each can type:
Jim = 20/40 = 1/2 pages/min
Sus = 20/30 = 2/3 pages/min
Jack = 20/24 = 5/6 pages/min
Now they will be working together, so the times are then the same. Multiply the rates times the same time, and they