a. It takes a night security officer 45 minutes to check each of the doors in an office

Chapter 7, Problem 7.7.5

(choose chapter or problem)

a. It takes a night security officer 45 minutes to check each of the doors in an office building to make sure they are locked. What is the officers rate of work? b. It takes an elementary school teacher 4 hours to make out the semester report cards. What part of the job does she complete in hours?

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