SOLUTION: Sally can paint a house in 4 hours and Joe can paint the same house in 6 hours. If they work together how long will it take them to paint the house? thanks

Question 1119: Sally can paint a house in 4 hours and Joe can paint the same house in 6 hours. If they work together how long will it take them to paint the house?
thanks
Found 3 solutions by usyim88hk, KtipsayFoozeBamps, timofer:
Answer by usyim88hk(158)   (Show Source): You can put this solution on YOUR website!
First you have to know how much painting they could done in one hour
:
For one hour, she can paint 1/4 of the house because 1 divide by 4 is 1/4
:
For Joe, he can paint 1/6 of the house in one hour because 1 divide by 6 is 1/6
:
So now we can add 1/4 and 1/6 together to determine how much they could paint in one hour which is equal to 3/12 + 2/12 = (5/12)
:
So they could finish 5/12 of painting in one hour, now we can devide 1 by (5/12) to determine how much time they need to paint the whole house
:
1/(5/12) = 2.4
:
So they took 2.4 hour (or 2 hours 24 mins) to paint a house together
Answer by KtipsayFoozeBamps(1)   (Show Source): You can put this solution on YOUR website!
12/5
Answer by timofer(104)   (Show Source): You can put this solution on YOUR website!
Sally, 1 house in 4 hours
Joe, 1 house in 6 hours

Both together, the combined rate is .

In hours per 1 house, this is
or 2 hours 24 minutes.
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