document.write( "Question 721109: Melinda can weed her garden in 40 minutes. When Bob helps, it takes them 15 minutes. How long would it take Bob to weed the garden alone? \n" ); document.write( "
Algebra.Com's Answer #442214 by josgarithmetic(39620)\"\" \"About 
You can put this solution on YOUR website!
Look at their rates but in the form of weed-the-garden per minute.\r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "Melinda: 1 job per 40 minutes, or 1/40 jobs per minute.
\n" ); document.write( "Melinda plus Bob: 1/15 jobs per minute.\r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "You want the rate for Bob alone? The rates are additive. Melinda plus Bob = Melinda+Bob.\r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "\"highlight%281%2F40%2BB=1%2F15%29\", where B is the rate at which Bob alone can weed the garden. This is all, again, jobs per minute. You are actually looking for the answer to the reciprocal of B.
\n" ); document.write( "
\n" );