rachelblanchette
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An experienced plumber can do the finishing plumbing work on a house in 8 hours. An inexperienced plumber will take 12 hours to do the same job. If two experienced men and three inexperienced men work on an emergency finishing project, how many hours will they take to do the job?

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The number of hours will they take to do the job is 2. Below is the solution:

2(1/8) + 3(1/12) = 1/x 
1/4 + 1/4 = 1/x 
1/2 = 1/x 
x = 2 

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