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Working alone it takes Jerry 9 hrs to mop a warehouse. Ruth can mop the same warehouse in 10 hrs. If they worked together how long would it take them?

  • Alegebra -

    Jerry does 1/9 of the work in one hour.
    Ruth does 1/10 of the work in one hour.
    Together they do 1/9+1/10 = 19/90 of the work in one hour.
    How long would it take them together to finish the work ?

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