Mathematics, 10.09.2021 06:00 cmaya

David typically takes 3 less hours than Marilyn to build a shelf if each works alone. David and Marilyn worked together to build a shelf for 1 hour, and then Marilyn finished the job without David after an additional 3 hours. How long would it have taken David to build the shelf alone? Do not include the units in your answer.

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David typically takes 3 less hours than Marilyn to build a shelf if each works alone. David and Mari...