document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=665546>Question 665546</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Jen cleans up the kitchen in 20 minutes, her brother Jen does it in 12 minutes, but Ben, their younger sibling, can mess up the kitchen in ten minutes. How many minutes does it take for the three of them to clean the kitchen? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #413903 by </B><A HREF=/tutors/aboutme.mpl?userid=bloggauta><B>bloggauta(8)</B></A><img src=\"/images/stars/stars-05.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=bloggauta><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=bloggauta><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=413903\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> (1k/20min)+(1k/12min)+(1k/10min)<BR>\n" );
document.write( "= 1/20 + 1/12 + 1/10 = (3+5+6)/60<BR>\n" );
document.write( "= 14/60= 7/30 &#8594; 7k/30min &#8594; 1k/(30/7)min<BR>\n" );
document.write( "then the three clean up the kitchen in (30/7)min<BR>\n" );
document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );