document.write( "Question 1012188: Rob takes 9 hours to clean the attic.
\n" ); document.write( "Huong can clean the same attic in 15 hours.
\n" ); document.write( "How long would it take if they worked together? \n" ); document.write( "

Algebra.Com's Answer #628054 by ikleyn(52802) $\"\"$ $\"About$

You can put this solution on YOUR website!
.
\n" ); document.write( "Rob takes 9 hours to clean the attic.
\n" ); document.write( "Huong can clean the same attic in 15 hours.
\n" ); document.write( "How long would it take if they worked together?
\n" ); document.write( "------------------------------------------------\r
\n" ); document.write( "\n" ); document.write( "

\r\n" );
document.write( "Rob makes    of the job in one hour.\r\n" );
document.write( "Huong makes  of the job in one hour.\r\n" );
document.write( "Working together, they make  =  =  of the job in one hour.\r\n" );
document.write( "Hence, it will take  =  hours for Rob and Huong to make the job working together.\r\n" );
document.write( "

\r
\n" ); document.write( "\n" ); document.write( "See the lesson Using fractions to solve word problems on joint work in this site for more solved problems on joint work.\r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( " \n" ); document.write( "

\n" );