document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=201089>Question 201089</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Filling a tank. A water tank has an inlet pipe and a drain<BR>\n" );
document.write( "pipe. A full tank can be emptied in 30 minutes if the drain<BR>\n" );
document.write( "is opened and an empty tank can be filled in 45 minutes<BR>\n" );
document.write( "with the inlet pipe opened. If both pipes are accidentally<BR>\n" );
document.write( "opened when the tank is full, then how long will it take to<BR>\n" );
document.write( "empty 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 #151354 by </B><A HREF=/tutors/aboutme.mpl?userid=josmiceli><B>josmiceli(19441)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=josmiceli><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=josmiceli><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=151354\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Let <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=t ALIGN=MIDDLE  ALT=\"t\"   DISABLED_style= \"max-width:90%; height:auto;\" > = time in minutes to empty tank with <BR>\n" );
document.write( "both pipes open<BR>\n" );
document.write( "Given:<BR>\n" );
document.write( "drain pipe rate:<BR>\n" );
document.write( "(1 tankful)/(30 min)<BR>\n" );
document.write( "inlet pipe rate:<BR>\n" );
document.write( "(1 tankful)/(45 min)<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=1%2F30+-+1%2F45+=+1%2Ft ALIGN=MIDDLE  ALT=\"1%2F30+-+1%2F45+=+1%2Ft\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "Multiply both sides by <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=90t ALIGN=MIDDLE  ALT=\"90t\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=3t+-+2t+=+90 ALIGN=MIDDLE  ALT=\"3t+-+2t+=+90\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=t+=+90 ALIGN=MIDDLE  ALT=\"t+=+90\"   DISABLED_style= \"max-width:90%; height:auto;\" > <BR>\n" );
document.write( "It will take 90 min to empty tank<BR>\n" );
document.write( "with both pipes open.  </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );