Mathematics, 01.06.2021 21:00, kerriscaballero12

An plumber can install pipes in 2 hours. His apprentice can install the same pipes in 5 hours. The apprentice starts installing the pipes and works for 1 hour. Then the plumber joins the apprentice and they finish the job together. How long did it take them to finish the job?

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An plumber can install pipes in 2 hours. His apprentice can install the same pipes in 5 hours. The apprentice starts installing the pipes and works for 1 hour. Then the plumber joins the apprentice and they finish the job together. How long did it take them to finish the job?​

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An plumber can install pipes in 2 hours. His apprentice can install the same pipes in 5 hours. The apprentice starts installing the pipes and works for 1 hour. Then the plumber joins the apprentice and they finish the job together. How long did it take them to finish the job?