document.write( "Question 799150: If bob can paint a house in 5 hours and joe can paint a house in 3 hours how many hours will it take to paint a house together? \n" ); document.write( "

Algebra.Com's Answer #482517 by josmiceli(19441) $\"\"$ $\"About$

You can put this solution on YOUR website!
Add their rates of painting
\n" ); document.write( "Bob's rate: ( 1 house ) / ( 5 hrs )
\n" ); document.write( "Joe's rate: ( 1 house ) / 3 hrs )
\n" ); document.write( "Let $\"+t+\"$ = the time in hours for
\n" ); document.write( "them to paint the house together
\n" ); document.write( "----------------------------
\n" ); document.write( " $\"+1%2F5+%2B+1%2F3+=+1%2Ft+\"$
\n" ); document.write( "Multiply both sides by $\"+15t+\"$
\n" ); document.write( " $\"+3t+%2B+5t+=+15+\"$
\n" ); document.write( " $\"+8t+=+15+\"$
\n" ); document.write( " $\"+t+=+1.875+\"$
\n" ); document.write( " $\"+.875%2A60+\"$ minutes
\n" ); document.write( "It will take them 1 hr and --- minutes
\n" ); document.write( "( you can do the above calculation )
\n" ); document.write( " \n" ); document.write( "

\n" );