Mathematics, 13.10.2020 15:01, allisongallion23

An experienced roofer can work twice as fast as her helper. Working together, they can shingle a new section of roof in 4 h. How long would it take the experienced roofer, working alone, to complete the same job?

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An experienced roofer can work twice as fast as her helper. Working together, they can shingle a new...