Mathematics, 17.10.2019 23:00 mexicanvanilla

Aroofer requires 9 h to a shingle roof. after the roofer and an apprentice work on a roof for 6 h, the roofer moves on to another job. the apprentice requires 12 more hours to finish the job. how long would it take the apprentice, working alone, to do the job?

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Aroofer requires 9 h to a shingle roof. after the roofer and an apprentice work on a roof for 6 h, t...

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