Mathematics, 30.07.2019 06:30 karrathomas

Working together, it takes two roofers 10 hours to put a new roof on a portable classroom. if the first roofer can do the job by himself in 12 hours, how many hours will it take the second roofer to do the job by himself?

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Working together, it takes two roofers 10 hours to put a new roof on a portable classroom. if the fi...

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