document.write( "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?
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Algebra.Com's Answer #664916 by josmiceli(19441) $\"\"$ $\"About$

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His rate of working in doors/hour is:
\n" ); document.write( "[ 1 door checked / 20 min ] x [ min / hr ] = [ doors checked / hr ]
\n" ); document.write( " $\"+%281+%2F+20%29%2A%28+60%2F1+%29+=+60%2F20+\"$
\n" ); document.write( " $\"+60%2F20+=+3+\"$ doors checked / hr
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