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English, 22.11.2020 03:20 destinyshanece08

Jeff can put shingles on a house in 9 hours while David can shingle the same house in 6 hours. If the two work together, how long would it take them to shingle the house? about 4 hours and 30 minutes
about 4 hours
about 3 hours and 30 minutes
about 3 hours

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Jeff can put shingles on a house in 9 hours while David can shingle the same house in 6 hours. If th...

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