SOLUTION: If sally can paint a house in 4 hours, and John can paint one in 6 hours. How long will it take them to paint the same house together.

SOLUTION: If sally can paint a house in 4 hours, and John can paint one in 6 hours. How long will it take them to paint the same house together.

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Question 425241: If sally can paint a house in 4 hours, and John can paint one in 6 hours. How long will it take them to paint the same house together.
Answer by htmentor(1343) (Show Source): You can put this solution on YOUR website!
Sally's rate of painting = 1/4 house per hour
John's rate of painting = 1/6 house per hour
Working together, their combined rate of painting = 1/4 + 1/6 = 6/24 + 4/24 = 10/24 house per hour
Inverting gives 24/10 hours per house = 2.4 hours
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