document.write( "Question 1020353: Carpenter A can build a chair in 6 hours while carpenter B can build the same chair in 9 hours. If Carpenter A starts working on a chair for two hours and then carpenter B joins him, how long will take for the two of them to finish the rest of the job? And. 12/5 hours. \n" ); document.write( "
Algebra.Com's Answer #636265 by josmiceli(19441)\"\" \"About 
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What fraction of the job does A
\n" ); document.write( "get done in 2 hrs?
\n" ); document.write( "-----------------
\n" ); document.write( "A's rate of working:
\n" ); document.write( "[ 1 chair ] / [ 6 hrs ]
\n" ); document.write( "\"+%28+1%2F6+%29%2A2+=+1%2F3+\"
\n" ); document.write( "That means 2/3 of the chair remains
\n" ); document.write( "to be built
\n" ); document.write( "-----------------
\n" ); document.write( "B's rate of working:
\n" ); document.write( "[ 1 chair ] / [ 9 hrs ]
\n" ); document.write( "Let \"+t+\" = time in hrs for them to
\n" ); document.write( "finish the chair working together
\n" ); document.write( "-----------------------------
\n" ); document.write( "Add their rates of working to get
\n" ); document.write( "rate working together
\n" ); document.write( "\"+1%2F6+%2B+1%2F9+=+%28+2%2F3%29+%2F+t+\"
\n" ); document.write( "\"+1%2F6+%2B+1%2F9+=+2%2F%283t%29+\"
\n" ); document.write( "Multiply both sides by \"+18t+\"
\n" ); document.write( "\"+3t+%2B+2t+=+12+\"
\n" ); document.write( "\"+5t+=+12+\"
\n" ); document.write( "\"+t+=+12%2F5+\" hrs
\n" ); document.write( "------------------
\n" ); document.write( "check answer:
\n" ); document.write( "\"+1%2F6+%2B+1%2F9+=+%28+2%2F3%29+%2F+t+\"
\n" ); document.write( "\"+1%2F6+%2B+1%2F9+=+%28+2%2F3%29+%2F%2812%2F5%29+\"
\n" ); document.write( "\"+3%2F18+%2B+2%2F18+=+%282%2F3%29%2A%285%2F12%29+\"
\n" ); document.write( "\"+5%2F18+=+10%2F36+\"
\n" ); document.write( "\"+5%2F18+=+5%2F18+\"
\n" ); document.write( "OK
\n" ); document.write( "
\n" );