10th grade algebra

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mary takes 3 hours to mow the yard. it takes sally 5 hours. how long would it take with them mowing it together? give the exact decimal answer.

  • 10th grade algebra -

    There are many ways to do this, but what I would like to do here is 1/3 + 1/5= 1/?

  • 10th grade algebra -

    1.7

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