Question 990355: Working together, Martin and Neil can paint a fence in 5 hours. After working together on a certain fence for 4 hours, Neil left the project. Martin finished the project by working alone for 3 hours. If Martin had painted the entire fence by himself, it would have taken him
Answer by stanbon(75887)   (Show Source):
You can put this solution on YOUR website! Working together, Martin and Neil can paint a fence in 5 hours.
Their rate is (1/5) job/hr
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After working together on a certain fence for 4 hours, Neil left the project.
They finished 4(1/5) = 4/5 of the job.
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Martin finished the project by working alone for 3 hours. If Martin had painted the entire fence by himself, it would have taken him
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Let Martin's rate be 1/x job/hr
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Note: In 3 hrs he completes (1/5) of the job
3(1/x) = (1/5)
(1/x) = 1/15 job hr.
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Ans: Martin's time to do the job alone is 15 hrs
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Cheers,
Stan H.
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