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Work Problem: Repairing a Road

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Manager
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Joined: 25 May 2009
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Concentration: Finance
Schools: CBS '14 (D), Ross '14 (A), Johnson '14 (M), Owen '14 (A)
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Work Problem: Repairing a Road [#permalink] New post 19 May 2010, 19:26
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It takes 4 men 6 hours to repair a road. How long will it take 7 men to do the job if they work at the same rate?
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Re: Work Problem: Repairing a Road [#permalink] New post 19 May 2010, 20:44
It takes 4 men 6 hours to repair a road. How long will it take 7 men to do the job if they work at the same rate?

So if 4 men repair the road in 6 hours, it would take 8 men 3 hours. There is an inverse relationship. 7 men would take more than 3 hours. 4x6 = 7h. 24= 7h, h=24/7. h= 3 3/7 hours.

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Re: Work Problem: Repairing a Road [#permalink] New post 20 May 2010, 02:18
4 men take 6 hours

1 man will take 24 hours ( notice that we have to multiply --- there is just 1 man doing all the work!! :) )

7 men will then do the work in 24/7 hours
Re: Work Problem: Repairing a Road   [#permalink] 20 May 2010, 02:18
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