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纠错
If it takes Daniel 9 hours to clean an office building and it takes Mark 6 hours, how long would it take the two of them, working together, to clean the building?
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A.3 hours
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B.3 hours 36 minutes
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C.4 hours 45 minutes
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D.6 hours
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E.7 hours 30 minutes
B显示答案
