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18 March, 20:38

It takes a night security officer 20 mins to check each of the doors in an office building to make sure they are locked. What is the officers rate of work?

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  1. 19 March, 00:09
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    If the number of doors is not given, then his rate of work would be he could check 3 doors in an hour. 60 minutes in an hour. 60/20=3
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