SOLUTION: IF IT TAKES SALLY 4 HOURS TO PAINT A HOUSE AND IT TAKES JOHN 6 HOURS TO PAINT THE SAME HOUSE, HOW LONG WOULD IT TAKE THEM TO PAINT THE SAME HOUSE TOGETHER. ANSWER: 2 HOURS AND 2

Question 75458: IF IT TAKES SALLY 4 HOURS TO PAINT A HOUSE AND IT TAKES JOHN 6 HOURS TO PAINT THE SAME HOUSE, HOW LONG WOULD IT TAKE THEM TO PAINT THE SAME HOUSE TOGETHER.
ANSWER: 2 HOURS AND 24 MINUTES
Answer by funmath(2933) (Show Source): You can put this solution on YOUR website!
If Susie can paint a house in 4 hrs and John can paint a house in 6 hrs. How long will it take them to paint it together?
This is the way I was taught this, but I know there is another way to do this:
Susie can paint 1 house in 4 hrs, her work rate is:1/4
John can paint 1 house in 6 hrs, his work rate is: 1/6
They both can paint 1 house in x hrs, their combined work rate is:1/x
:
Problem to solve:

Cross multiply, or flip both sides over and you have:

x=12/5 hrs.
x=2 and 2/5 hrs there are 60 minutes in an hour
x=2 hrs and (2/5)(60)min
x=2 hrs and 24 mins.
Happy Calculating!!!!
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