document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=170779>Question 170779</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Three pipes are connected to a water tank.  One of the pipes can fill the tank in 30 min.  The second pipe can fill it in 20 min.  The third pipe can fill the tank in 40 min.  If the slowest pipe is shut off after 3 min and fastest is shut off 3 min later, how long will it take the remaining open pipe to finish filling 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 #126099 by </B><A HREF=/tutors/aboutme.mpl?userid=scott8148><B>scott8148(6628)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=scott8148><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=scott8148><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=126099\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> they each fill some FRACTION of the tank, based on their individual filling times\r<BR>\n" );
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document.write( "let x=remaining fill time __ <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=3%2F40%2B6%2F20%2B%28x%2B6%29%2F30=1 ALIGN=MIDDLE  ALT=\"3%2F40%2B6%2F20%2B%28x%2B6%29%2F30=1\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "multiplying by 120 __ 9+36+4x+24=120 __ 4x+69=120\r<BR>\n" );
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document.write( "subtracting 69 __ 4x=51\r<BR>\n" );
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document.write( "dividing by 4 __ x=51/4 __ x=12min 45sec </SPAN>\n" );
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