document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=253212>Question 253212</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A water tank has an inlet pipe and a drain pipe. A full tank can be emptied in 30 minutes if the drain is opened and empty tank can be filled in 45 minutess with the inlet pipe opened.  If both pipes are accidently opened when the tank is full, then how long would it take to empty the tank?\r<BR>\n" );
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document.write( "I believe this is a trick question and can possible be unknown. </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #185453 by </B><A HREF=/tutors/aboutme.mpl?userid=Earlsdon><B>Earlsdon(6294)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=Earlsdon><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/images/nopicture.jpg><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=185453\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> A \"tricky\" question but not a \"trick\" question!<BR>\n" );
document.write( "Let's first find the fill rate and emptying rate.<BR>\n" );
document.write( "Notice that the tank is being emptied (30 mins.) faster than it is being filled (45 mins.).<BR>\n" );
document.write( "If the tank can be filled in 45 minutes, then <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=1%2F45 ALIGN=MIDDLE  ALT=\"1%2F45\"   DISABLED_style= \"max-width:90%; height:auto;\" > of the tank can be filled in 1 minute.<BR>\n" );
document.write( "If the tank can be emptied in 30 minutes, then <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=1%2F30 ALIGN=MIDDLE  ALT=\"1%2F30\"   DISABLED_style= \"max-width:90%; height:auto;\" > of the tank can be emptied in 1 minute.<BR>\n" );
document.write( "If both events are occuring simultaneously, then the net result is:<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=1%2F45-1%2F30+=+%282-3%29%2F90 ALIGN=MIDDLE  ALT=\"1%2F45-1%2F30+=+%282-3%29%2F90\"   DISABLED_style= \"max-width:90%; height:auto;\" >=<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=-1%2F90 ALIGN=MIDDLE  ALT=\"-1%2F90\"   DISABLED_style= \"max-width:90%; height:auto;\" > This means that <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=1%2F90 ALIGN=MIDDLE  ALT=\"1%2F90\"   DISABLED_style= \"max-width:90%; height:auto;\" > of the tank will be emptied (negative) in 1 minute, so it will take 90 minutes to empty the tank if both pipes are open. </SPAN>\n" );
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