#### It takes Janet 5 hours to paint a wall of a house.

Robert takes 7 hours to paint the same wall. If they work together, how long would it take paint the wall?

#### Janet’s Work Rate Is,

#### Robert’s Work Rate Is,

#### Working Together,

#### Add their labor and set equal to 1/t,

#### Multiply each term by the lowest common denominator,

#### Finally, solve for t,

#### Or almost 3 hours!

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