document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=981916>Question 981916</A>: <I><SPAN STYLE=\"word-break: break-all;\"> It takes 120 minutes for a hose to fill a swimming pool. If the pool drain is open, it takes 360 minutes to fill the pool. If the pool is full, the hose is off, and drain is open, how many minutes does it take to empty the pool? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #602826 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=602826\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Rate of filling with just the hose:<BR>\n" );
document.write( "[ 1 pool filled ] / [ 120 min ]<BR>\n" );
document.write( "Let <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+r+ ALIGN=MIDDLE  ALT=\"+r+\"   DISABLED_style= \"max-width:90%; height:auto;\" > = the rate that the <BR>\n" );
document.write( "drain by itself empties the pool<BR>\n" );
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document.write( "Add the rates of the hose and the drain<BR>\n" );
document.write( "open together, but make the drain's rate <BR>\n" );
document.write( "negative ( emptying )<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+1%2F120+-+r+=+1%2F360+ ALIGN=MIDDLE  ALT=\"+1%2F120+-+r+=+1%2F360+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+r+=+-+3%2F360+%2B+1%2F360+ ALIGN=MIDDLE  ALT=\"+r+=+-+3%2F360+%2B+1%2F360+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+r+=+-1%2F180+ ALIGN=MIDDLE  ALT=\"+r+=+-1%2F180+\"   DISABLED_style= \"max-width:90%; height:auto;\" > ( it's negative, as it should be )<BR>\n" );
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document.write( "So, the drain by itself empties 1 pool in<BR>\n" );
document.write( "180 min by itself<BR>\n" );
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document.write( "Check:<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+1%2F120+-+r+=+1%2F360+ ALIGN=MIDDLE  ALT=\"+1%2F120+-+r+=+1%2F360+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+1%2F120+-+1%2F180+=+1%2F360+ ALIGN=MIDDLE  ALT=\"+1%2F120+-+1%2F180+=+1%2F360+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+3%2F360+-+2%2F360+=+1%2F360+ ALIGN=MIDDLE  ALT=\"+3%2F360+-+2%2F360+=+1%2F360+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+1%2F360+=+1%2F360+ ALIGN=MIDDLE  ALT=\"+1%2F360+=+1%2F360+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "OK<BR>\n" );
document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );