document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=154584>Question 154584</A>: <I><SPAN STYLE=\"word-break: break-all;\"> .<BR>\n" );
document.write( "........................................................................................an inlet pipe can filla tank in 1 hour, a drain pipe can empty it in 3/2 hours. The inlet pipe was openend at 6:00 a.m. to fill the tank. At 6:20a.m. someone noticed that the drain has been left open and so he closes it immediately. How long will it take the first pipe to finish filling </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #113841 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=113841\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> An inlet pipe can fill a tank in 1 hour; a drain pipe can empty it in 3/2 hours. The inlet pipe was opened at 6:00 a.m. to fill the tank. At 6:20 a.m. someone noticed that the drain has been left open and so he closes it immediately. How long will it take the first pipe to finish filling.<BR>\n" );
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document.write( "Let's deal in minutes here:<BR>\n" );
document.write( "Inlet time = 60 min<BR>\n" );
document.write( "Drain time = 90 min<BR>\n" );
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document.write( "let t = time (in minutes) required to finish filling the tank.<BR>\n" );
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document.write( "Let the full tank = 1:<BR>\n" );
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document.write( "Total on time for the inlet pipe = (t+20)<BR>\n" );
document.write( "On time for the drain = 20 min<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=%28%28t%2B20%29%29%2F60 ALIGN=MIDDLE  ALT=\"%28%28t%2B20%29%29%2F60\"   DISABLED_style= \"max-width:90%; height:auto;\" > - <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=20%2F90 ALIGN=MIDDLE  ALT=\"20%2F90\"   DISABLED_style= \"max-width:90%; height:auto;\" > = 1<BR>\n" );
document.write( "Multiply equation by 180 to get rid of the denominators, results:<BR>\n" );
document.write( "3(t+20) - 2(20) = 180<BR>\n" );
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document.write( "3t + 60 - 40 = 180<BR>\n" );
document.write( "3t + 20 = 180<BR>\n" );
document.write( "3t = 180 - 20<BR>\n" );
document.write( "3t = 160<BR>\n" );
document.write( "t = <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=160%2F3 ALIGN=MIDDLE  ALT=\"160%2F3\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "t = 53.333 min or 53 min 20 sec to finish filling the tank<BR>\n" );
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document.write( "Check with calc (inlet time: 53.33 + 20 = 73.33)<BR>\n" );
document.write( "(73.33/60) - (20/90) = 1<BR>\n" );
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