SOLUTION: Fran Thompson can wash windows in the lobby at the Days Inn in 3 hours. Jill Franks can wash the same windows in 4.5 hours. How long will it take them working together to wash the

Question 1099742: Fran Thompson can wash windows in the lobby at the Days Inn in 3 hours. Jill Franks can wash the same windows in 4.5 hours. How long will it take them working together to wash the windows?

Found 2 solutions by josmiceli, Alan3354:
Answer by josmiceli(19441) (Show Source): You can put this solution on YOUR website!
Add their rates of washing to get their rate washing together
Fran's rate:
[ 1 job ] / [ 3 hrs ]
Jill's rate:
[ 1 job ] / [ 4.5 hrs ]
Working together:
[ 1 job ] / [ t hrs ]
-----------------------

Multiply both sides by

Working together, they can wash the windows
in 1 hr 48 min
-----------------------
check answer:

Multiply both sides by

OK
Answer by Alan3354(69443) (Show Source): You can put this solution on YOUR website!
Fran Thompson can wash windows in the lobby at the Days Inn in 3 hours. Jill Franks can wash the same windows in 4.5 hours. How long will it take them working together to wash the windows?
-----------
3*4.5/(3+4.5) = 1.8 hours
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