document.write( "Question 609311: zach can wash all the windows in his house in 3 hours. His brother COry can do the same job in 5 hours. How long will it take them to wash all the windows if they work together \n" ); document.write( "
Algebra.Com's Answer #383920 by ankor@dixie-net.com(22740)\"\" \"About 
You can put this solution on YOUR website!
zach can wash all the windows in his house in 3 hours.
\n" ); document.write( " His brother COry can do the same job in 5 hours.
\n" ); document.write( " How long will it take them to wash all the windows if they work together
\n" ); document.write( ":
\n" ); document.write( "Let t = time required, working together
\n" ); document.write( "Let the completed job = 1, (clean windows)
\n" ); document.write( ":
\n" ); document.write( "A typical shared work equation, each will do a fraction of the job, the two fractions add up 1
\n" ); document.write( ":
\n" ); document.write( "\"t%2F3\" + \"t%2F5\" = 1
\n" ); document.write( "multiply by 15 to clear the denominators
\n" ); document.write( "5t + 3t = 15
\n" ); document.write( "8t = 15
\n" ); document.write( " t = 15/8
\n" ); document.write( " t = 1.875 hrs working together
\n" ); document.write( ";
\n" ); document.write( " \n" ); document.write( "
\n" );