SOLUTION: Rebecca can sweep the driveway in 30 minutes. Owen can sweep the driveway in 40 minutes. If Owen works for 8 minutes before Rebecca begins to help, how long do they work together t

Algebra ->  Rate-of-work-word-problems -> SOLUTION: Rebecca can sweep the driveway in 30 minutes. Owen can sweep the driveway in 40 minutes. If Owen works for 8 minutes before Rebecca begins to help, how long do they work together t      Log On


   

Question 1003411: Rebecca can sweep the driveway in 30 minutes. Owen can sweep the driveway in 40 minutes. If Owen works for 8 minutes before Rebecca begins to help, how long do they work together to complete two driveways?
Answer by josgarithmetic(39623) About Me  (Show Source):
You can put this solution on YOUR website!
Rebecca, 1%2F30
Owen, 1%2F40
Unit is DRIVEWAY%2FMINUTES.

Let time t be while Rebecca helps to finish with Owen.
%281%2F40%29%2A8%2B%281%2F30%2B1%2F40%29%2At=2---------The equal to 2 is for the requested, "two driveways". Solve for t.