document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=745076>Question 745076</A>: <I><SPAN STYLE=\"word-break: break-all;\"> One pipe can fill a tank in 5 hours and another pipe can fill the same tank in 4 hours. A drainpipe can empty the full content of the tank in 20 hours. With all the three pipes open, how long will it take to fill 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 #453701 by </B><A HREF=/tutors/aboutme.mpl?userid=nerdybill><B>nerdybill(7384)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=nerdybill><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=nerdybill><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=453701\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> One pipe can fill a tank in 5 hours and another pipe can fill the same tank in 4 hours. A drainpipe can empty the full content of the tank in 20 hours. With all the three pipes open, how long will it take to fill the tank?<BR>\n" );
document.write( ".<BR>\n" );
document.write( "Let x = time (hours) it takes to fill tank<BR>\n" );
document.write( "then<BR>\n" );
document.write( "x(1/5 + 1/4 - 1/20) = 1<BR>\n" );
document.write( "multiplying both sides by 20:<BR>\n" );
document.write( "x(4 + 5 - 1) = 20<BR>\n" );
document.write( "x(8) = 20<BR>\n" );
document.write( "x = 20/8<BR>\n" );
document.write( "x = 5/2<BR>\n" );
document.write( "x = 2.5 hours </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );