Question 534319
 Joes team can completely manicure the lawn at Detroit Park in 12 hours. When Sally's team was brought on to help, the job was done in about 5 1/2 hours. How long does it takes Sally's team to completely manicure the lawn when they are working alone?
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Joe's rate: 1/12 job/hr
Together rate: 1/(11/2) = 2/11 job/hr
Sally rate = 1/x job/hr
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Equation:
rate + rate = together rate
1/12 + 1/x = 2/11
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Multiply thru by 132x to get:
11x + 132 = 24x
13x = 132
x = 10 hrs 9 minutes (time for Sally's team to do the job alone)
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Cheers,
Stan H
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