If it takes Daniel 9 hours to clean an office building and it tak

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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?

A、3 hours
B、3 hours 36 minutes
C、4 hours 45 minutes
D、6 hours
E、7 hours 30 minutes

答案：B

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