SOLUTION: If sally can paint a house in 4 hours and john can paint the same house in 6 hours how long will it take for both of them to paint the house together?

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If A can do a job in x time periods, then A can do of the job in 1 time period. Likewise, if B can do the same job in y time periods, then B can do of the job in 1 time period.

So, working together, they can do



of the job in 1 time period.

Therefore, they can do the whole job in:



time periods.


John

You can put this solution on YOUR website!
In words:
sally's rate of painting is (1 house) / (4 hours)
John's rate of painting is (1 house) / (6 hours)
If I add the rates, I get the rate of both
working together

Multiply both sides by



Working together, they can paint the house in 2.4 hours