SOLUTION: An installer can carpet a room in 3 hrs, an assistant needs 4.5 hours. If the assistant helps for one hour and then is called away, how long will it take the installer to finish

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Question 454223: An installer can carpet a room in 3 hrs, an assistant needs 4.5 hours. If the assistant helps for one hour and then is called away, how long will it take the installer to finish
Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
An installer can carpet a room in 3 hrs, an assistant needs 4.5 hours. If the assistant helps for one hour and then is called away, how long will it take the installer to finish
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Installer rate = 1/3 job/hr
Assistant rate = 1/(9/2) = 2/9 job/hr
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Equations:
work + work = job done
1(2/9) + (1/3)x = 1
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(1/3)x = 7/9
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x = 7/3 = 2 1/3 hrs
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Cheers,
Stan H.
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