document.write( "Question 897896: It takes you 15 minutes to wash a car and it takes a friend in 9 minutes to wash a car how long does it take the two of you to wash 8 cars if you work together \n" ); document.write( "
Algebra.Com's Answer #544420 by richwmiller(17219)![]() ![]() You can put this solution on YOUR website! a=15 \n" ); document.write( "b=9 \n" ); document.write( "1/a+1/b=1/x \n" ); document.write( "1/15+1/9=1/x \n" ); document.write( "1/15+1/9=1/5.625 \n" ); document.write( "1/x=1/5.625 \n" ); document.write( "x=5.625 per car together \n" ); document.write( "8*5.625=45 minutes for them to wash 8 cars together \n" ); document.write( " |