document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1005970>Question 1005970</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Working alone, Leo can clean the windows in the living room in 30 minutes; it would take Margaret 20 minutes to do the same task. How long would it take them working together? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #622126 by </B><A HREF=/tutors/aboutme.mpl?userid=Alan3354><B>Alan3354(69443)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=Alan3354><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=Alan3354><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=622126\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Working alone, Leo can clean the windows in the living room in 30 minutes; it would take Margaret 20 minutes to do the same task. How long would it take them working together?<BR>\n" );
document.write( "-------------<BR>\n" );
document.write( "Leo cleans 1/30 of a window per minute.<BR>\n" );
document.write( "Mar cleans 1/20 of a window per minute.<BR>\n" );
document.write( "---<BR>\n" );
document.write( "Together, they clean 1/30 + 1/20 per minute.<BR>\n" );
document.write( "= 50/600 = 1/12 window per minute<BR>\n" );
document.write( "--> 12 min/window </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );