document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=522778>Question 522778</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A certain tank can be filled by pipe A in 12 minutes. Pipe B can empty the tank in 18 minutes. If both pipes are open, how long will it take to fill or 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 #347013 by </B><A HREF=/tutors/aboutme.mpl?userid=ankor@dixie-net.com><B>ankor@dixie-net.com(22740)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=ankor@dixie-net.com><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=ankor@dixie-net.com><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=347013\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> A certain tank can be filled by pipe A in 12 minutes. Pipe B can empty the tank in 18 minutes.<BR>\n" );
document.write( " If both pipes are open, how long will it take to fill or empty the tank?<BR>\n" );
document.write( ":<BR>\n" );
document.write( "It takes less time to fill it than to empty it, therefore with both valves open the tank will be filled eventually<BR>\n" );
document.write( ":<BR>\n" );
document.write( "Let t = time to fill the tank with both valves open<BR>\n" );
document.write( "Let a full tank = 1<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=t%2F12 ALIGN=MIDDLE  ALT=\"t%2F12\"   DISABLED_style= \"max-width:90%; height:auto;\" > - <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=t%2F18 ALIGN=MIDDLE  ALT=\"t%2F18\"   DISABLED_style= \"max-width:90%; height:auto;\" > = 1<BR>\n" );
document.write( "multiply by 36<BR>\n" );
document.write( "36*<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=t%2F12 ALIGN=MIDDLE  ALT=\"t%2F12\"   DISABLED_style= \"max-width:90%; height:auto;\" > - 36*<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=t%2F18 ALIGN=MIDDLE  ALT=\"t%2F18\"   DISABLED_style= \"max-width:90%; height:auto;\" > = 36(1)<BR>\n" );
document.write( "Cancel the denominators, results<BR>\n" );
document.write( "3t - 2t = 36<BR>\n" );
document.write( "t = 36 hrs to fill the tank with both valves left open </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );