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Mathematics, 22.10.2019 01:30 issagirl05

Jackson can remove the shingles off of a house in 7 hours, while martin can remove the shingles in 5 hours. how long will it take them to remove the shingles if they work together?

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Jackson can remove the shingles off of a house in 7 hours, while martin can remove the shingles in 5...
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