document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=280103>Question 280103</A>: <I><SPAN STYLE=\"word-break: break-all;\"> There are 480 dishes that need to be rinsed. John can rinse them in 80 minutes by himself. It will take his friend Bob 120 minutes to rinse these dishes. How long will it take them if they rinse these 480 dishes together?  </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #203524 by </B><A HREF=/tutors/aboutme.mpl?userid=richwmiller><B>richwmiller(17219)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=richwmiller><IMG SRC=http://www.algebra.com/images/aboutme-small.gif BORDER=0 alt=\"About Me\" VALIGN=MIDDLE></A>&nbsp;<IMG SRC=http://www.algebra.com/cgi-bin/show-face.mpl?user=richwmiller><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=203524\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> We have to assume there are two places with easy access to the same dishes and the two workers don't get in each other's way.<BR>\n" );
document.write( "Even 80 minutes seem to be excessively long to rinse dishes. We are not talking about washing them but just rinsing them.\r<BR>\n" );
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document.write( "x/80+x/120=1<BR>\n" );
document.write( "3x+2x=240<BR>\n" );
document.write( "5x=240<BR>\n" );
document.write( "x=240/5<BR>\n" );
document.write( "x=48 minutes together\r<BR>\n" );
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document.write( "another interesting way to calculate using the 480 dishes<BR>\n" );
document.write( "in 1 minute john can do 480/80=6 dishes<BR>\n" );
document.write( "in 1 minute bob can do 480/120=4 dishes<BR>\n" );
document.write( "4x+6x=480<BR>\n" );
document.write( "10x=480<BR>\n" );
document.write( "x=48 minutes <BR>\n" );
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