document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=399891>Question 399891</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A water tank is connected to the two pumps. It takes 40 minutes to fill the tank from the pump at the top and 60 minutes to empty using the the pump at the bottom.. If we pump the water at the same time, how many hours will it take to fill the tank from empty? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #283116 by </B><A HREF=/tutors/aboutme.mpl?userid=mananth><B>mananth(16946)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=mananth><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=mananth><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=283116\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> A water tank is connected to the two pumps. It takes 40 minutes to fill the tank from the pump at the top and 60 minutes to empty using the the pump at the bottom.. If we pump the water at the same time, how many hours will it take to fill the tank from empty?\r<BR>\n" );
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document.write( "pump A ----- 40 minutes filling<BR>\n" );
document.write( "so it does 1/40 of job in 1 minute,<BR>\n" );
document.write( "Pump B ----------- 60 minutes draining<BR>\n" );
document.write( "so it does 1/60 of the job in 1 minute.<BR>\n" );
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document.write( "1/40 -1/60 is the job done in 1 minute when both are open<BR>\n" );
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document.write( "(60-40)/2400= 20/2400====> 2/240======> 1/120 of the job <BR>\n" );
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document.write( "so it will take 120 minutes to fill the pool.\r<BR>\n" );
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document.write( "m.ananth@hotmail.ca </SPAN>\n" );
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