SOLUTION: working alone, Nicole can sweep A porch in 15 minutes. Mark can sweep the same porch in 9 minutes. Find how long it would take them if they worked together.

Question 1042462: working alone, Nicole can sweep A porch in 15 minutes. Mark can sweep the same porch in 9 minutes. Find how long it would take them if they worked together.
Answer by ikleyn(52878) (Show Source): You can put this solution on YOUR website!
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working alone, Nicole can sweep A porch in 15 minutes. Mark can sweep the same porch in 9 minutes.
Find how long it would take them if they worked together.
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Standard joint work problem.

Nicole makes  of the job per minute.
Mark   makes  of the job per minute.

Working together, they make  =  =  of the job per minute.

So, they need  minutes to complete the job working together.

For a bunch of similar solved joint work problems see the lessons
    - Using Fractions to solve word problems on joint work,
    - Solving more complicated word problems on joint work,
    - Selected joint-work word problems from the archive
in this site.

Read them and become an expert in solving these problems.

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