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

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Question 1049388: It takes a night security officer 20 minutes to check each of the doors in an office building to make sure they are locked. What is the officer's rate of work?
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
His rate of working in doors/hour is:
[ 1 door checked / 20 min ] x [ min / hr ] = [ doors checked / hr ]
+%281+%2F+20%29%2A%28+60%2F1+%29+=+60%2F20+
+60%2F20+=+3+ doors checked / hr