document.write( "Question 21904: Alice can vacuum in 40 minutes. It takes bob 45 minutes to do the same job. Find the time it takes Alice and Bob to do the job together. \n" ); document.write( "
Algebra.Com's Answer #10555 by venugopalramana(3286)\"\" \"About 
You can put this solution on YOUR website!
: If it takes me 4 hours to paint a huse and it take you 6 hours, how long willit take both of us working together?1 solutions Answer 9497 by venugopalramana(345) on 2005-11-15 10:54:53 (Show Source): SEE THE FOLLOWING AND TRY YOUR PROBLEM.IF THERE IS STILL DIFFICULTY PLEAS COME BACK Answer 9266 by venugopalramana(334) on 2005-11-11 01:54:43 (Show Source): SEE THIS EXAMPLE AND DO IN THE SAME MANNER Joe digs a ditch in 3.2 hours.Joe working with George can did the same length ditch in 2.7 hours.How long would it take George to dig the ditch by himself. 1 solutions --------------------------------------------------------------------------------Answer 9228 by venugopalramana(299) on 2005-11-10 06:00:00 (Show Source): Joe digs a ditch in 3.2 hours.Joe working with George can did the same length ditch in 2.7 hours.How long would it take George to dig the ditch by himself. Joe digs a ditch in 3.2 hours...so in 1 hour he digs 1/3.2 ditch=10/32=5/16let george alone take x hrs to dig the ditch...so in 1 hour he digs 1/x ditchso in 1 hour joe and george together dig 5/16+1/x ditch =(5x+16)/16x so they take 16x/(5x+16) hrs to dig the ditch togetherbut this given as 2.7 hoursso 16x/(5x+16)=2.7cross multiplying we get 16x=2.7(5x+16)=13.5x+43.216x-13.5x=43.22.5x=43.2x=43.2/2.5=432/25=17.28 hoursso george alone takes 17.28 hrs to dig the ditch \n" ); document.write( "
\n" );