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-   -   Setting up equation? (https://www.askmehelpdesk.com/showthread.php?t=8796)

  • Apr 3, 2005, 02:48 PM
    brunettegal37
    setting up equation?
    I can not get how to form a formula or equation for this question. I don't want the answer I just need help getting it started. Thanks

    Jim can mow Mr.Smith's lawn in 6 hours, Bob can mow Mr.Smith's lawn in 4 hours. How long would it take them to mow the yard if they worked together?
  • Apr 5, 2005, 09:25 PM
    reinsuranc
    Work problems
    Jim can mow Mr.Smith's lawn in 6 hours, Bob can mow Mr.Smith's lawn in 4 hours. How long would it take them to mow the yard if they worked together?

    Just to get you started:

    Jim can do 1/6 of the job per hour, Bob can do 1/4 of the job per hour. So together they can do 1/6 + 1/4 of the job per hour.

    Is that enough of a hint?
  • Apr 9, 2005, 03:33 PM
    Dr_Calculus
    yup
    I think reinsuranc has the best method to do the problem... I guess if you want to state the solution more algebraically, we could say:

    1/4 x +1/6 x = 1

    where x is the number of hours needed for them to finish the job together. If there are others working on it, tack on the extra members' contributions.

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