<PRE><B>Question 86608</B>
It takes Steven 8 hours to clean the yard and mow the yard. Steven and his brother Gregory can do the same job in three hours when they work together. How long does it take Gregory to do the job when he works alone? 
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Steven DATA:
time = 8 hr/job ; rate = 1/8 job/hr
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Together DATA:
time = 3 hr/job ; rate = 1/3 job/hr
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Gregory  DATA:
time = x hr/job ; rate = 1/x job/hr
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EQuATIOn:
rate + rate = together rate
1/8 + 1/x = 1/3
3x + 24 = 8x
5x=24
x = 4.8 hrs = 4 hrs 48 minutes (Gregory time to do the job)
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Cheers,
Stan H.

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