document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=471420>Question 471420</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A water tank can be filled in 20 hours by an inlet pipe and emptied in 24 hours by an outlet pipe. How long will it take to fill the tank if both pipes are left open?  </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #323305 by </B><A HREF=/tutors/aboutme.mpl?userid=sudhanshu_kmr><B>sudhanshu_kmr(1152)</B></A><img src=\"/images/stars/stars-12.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=sudhanshu_kmr><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=sudhanshu_kmr><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=323305\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> <BR>\n" );
document.write( "portion of tank will fill in one hour = 1/20 -1/24 = 1/120\r<BR>\n" );
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document.write( "so, it will take 120 hours to fill the tank of both pipes are open.<BR>\n" );
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