document.write( "Question 935386: Dan can tile a floor in 3 hours. His assistant could tile the same floor in 8 hours. If they work together, how long will it take to tile the floor? \n" ); document.write( "

Algebra.Com's Answer #568586 by TimothyLamb(4379) $\"\"$ $\"About$

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r = w/t
\n" ); document.write( "t = w/r
\n" ); document.write( "---
\n" ); document.write( "rates are additive:
\n" ); document.write( "r = 1/3 + 1/8
\n" ); document.write( "r = 8/24 + 3/24
\n" ); document.write( "r = 11/24
\n" ); document.write( "t = 1/r
\n" ); document.write( "t = 24/11
\n" ); document.write( "t = 2.18 hours
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