document.write( "Question 625619: An experienced bricklayer can construct a small wall in 2 hours. An apprentice can complete the job in 6 hours. Find how long it takes if they work together. \n" ); document.write( "

Algebra.Com's Answer #393650 by josmiceli(19441) $\"\"$ $\"About$

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Add their rates of working
\n" ); document.write( " experienced bricklayer:
\n" ); document.write( "( 1 job ) / ( 2 hrs )
\n" ); document.write( "apprentice:
\n" ); document.write( "( 1 job ) / ( 6 hrs )
\n" ); document.write( "--------------
\n" ); document.write( "Let $\"+t+\"$ = time to do job working together
\n" ); document.write( " $\"+1%2F2+%2B+1%2F6+=+1%2Ft+\"$
\n" ); document.write( "Multiply both sides by $\"+6t+\"$
\n" ); document.write( " $\"+3t+%2B+t+=+6+\"$
\n" ); document.write( " $\"+4t+=+6+\"$
\n" ); document.write( " $\"+t+=+3%2F2+\"$
\n" ); document.write( "It will take them an hour and a half working together \n" ); document.write( "

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