document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=714440>Question 714440</A>: <I><SPAN STYLE=\"word-break: break-all;\"> An oil tank has two inlet pipes and one outlet pipe. One inlet pipe can fill the tank in 12 hours, and the other inlet pipe can fill the tank in 20 hours. The outlet pipe can empty the tank in 10 hours. How long would it take to fill the tank with all three pipes open? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #438800 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=438800\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\">     An oil tank has two inlet pipes and one outlet pipe. One inlet pipe can fill the tank in 12 hours, and the other inlet pipe can fill the tank in 20 hours. The outlet pipe can empty the tank in 10 hours. How long would it take to fill the tank with all three pipes open?<BR>\n" );
document.write( "Let x = time (hours) it takes to fill<BR>\n" );
document.write( "then<BR>\n" );
document.write( "x(1/12 + 1/20 - 1/10) = 1<BR>\n" );
document.write( "multiply both sides by 120: common denominator<BR>\n" );
document.write( "x(10 + 6 - 12) = 120<BR>\n" );
document.write( "x(16 - 12) = 120<BR>\n" );
document.write( "x(4) = 120<BR>\n" );
document.write( "x = 30 hours </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );