document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=513681>Question 513681</A>: <I><SPAN STYLE=\"word-break: break-all;\">  a pump can pump out water from a tank in 11 hours. another pump can pump out water from the same tank in 20 hours. how long will it take both pumps to pump out the water in the tank? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #343098 by </B><A HREF=/tutors/aboutme.mpl?userid=nerdybill><B>nerdybill(7384)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=nerdybill><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=nerdybill><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=343098\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\">  a pump can pump out water from a tank in 11 hours. another pump can pump out water from the same tank in 20 hours. how long will it take both pumps to pump out the water in the tank?<BR>\n" );
document.write( ".<BR>\n" );
document.write( "Let x = time (hours) it takes for both <BR>\n" );
document.write( "then<BR>\n" );
document.write( "x(1/11 + 1/20) = 1<BR>\n" );
document.write( "multiplying both sides by 220:<BR>\n" );
document.write( "x(20 + 11) = 220<BR>\n" );
document.write( "x(31) = 220<BR>\n" );
document.write( "x = 220/31<BR>\n" );
document.write( "x = 7.1 hours<BR>\n" );
document.write( "or <BR>\n" );
document.write( "x = 7 hours and 6 minutes<BR>\n" );
document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );