document.write( "Question 663482: It takes Sarah 15 min to pick apples from the tree in her backyard. Lisa takes 25 min. How long will it take them working together? \n" ); document.write( "
Algebra.Com's Answer #412828 by jerryguo41(197)\"\" \"About 
You can put this solution on YOUR website!
(rate of person a)*time + (rate of person b)*time = 1\r
\n" ); document.write( "\n" ); document.write( "rate of person a = \"1%2F15\" (every 15 min she gets one apple)
\n" ); document.write( "rate of person b = \"1%2F25\" (every 25 min she gets one apple)\r
\n" ); document.write( "\n" ); document.write( "\"%281%2F15%29t%2B%281%2F25%29t=1\"
\n" ); document.write( "Clear Fractions
\n" ); document.write( "\"75%28%281%2F15%29t%2B%281%2F25%29t%29=75+\"
\n" ); document.write( "\"5t%2B3t=75\"
\n" ); document.write( "\"8t=75\"
\n" ); document.write( "\"t=9.375\"
\n" ); document.write( "or 9 min and 22.5 seconds
\n" ); document.write( "
\n" );