trent can deliver his newspapers in 30 minutes. it takes lois 20 minutes to do the same route. how long would it take them to deliver the newspapers if they work together?
i understand how to do this problem in hours but not minutes...

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15 minutes.

the book has 12 minutes as the answer....

\[\frac{1}{30} + \frac{1}{20} = \frac1x\]Solve for x to get the time taken if they both do it.

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