SOLUTION: Word Problem: it takes vince 9 minutes to mow the lawn if he works alone. If phil helps they can get the lawn mowed in 5 minutes. How long would it take phil to mow the lawn workin

Question 1029987: Word Problem: it takes vince 9 minutes to mow the lawn if he works alone. If phil helps they can get the lawn mowed in 5 minutes. How long would it take phil to mow the lawn working alone?
Answer by FrankM(1040) (Show Source): You can put this solution on YOUR website!
Here is my approach - others may have a different method. When I think of rate, it's "miles per hour" or "units per time"
Vince can mow 6-2/3 lawns per hour. (60/9 = 6.667)
Vince + Phil mow 12 lawns per hour. (60/5 = 2)
So it's simple subtraction, Phil can mow 5-1/3 lawns in 1 hour. And 60/5.33= 11.25 or 11-1/4 minutes to mow one.
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