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Mathematics, 13.10.2020 01:01 hinojosachristian1

It takes Sam 4 hours to rake the front lawn, while his brother, Dave, can rake the lawn in 2 hours. How long will it take them to rake the lawn working together answer 1hr 20 min

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It takes Sam 4 hours to rake the front lawn, while his brother, Dave, can rake the lawn in 2 hours....
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