document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=937613>Question 937613</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A tank can be filled by one pipe in 12 hours, by a second pipe in 7 hours, and by a third pipe in 4 hours. If all three pipes are 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 #571001 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=571001\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> A tank can be filled by one pipe in 12 hours, by a second pipe in 7 hours, and by a third pipe in 4 hours. If all three pipes are open, how long will it take to fill the tank.<BR>\n" );
document.write( ".<BR>\n" );
document.write( "Let t = time (hours) it takes to fill tank<BR>\n" );
document.write( "then<BR>\n" );
document.write( "t(1/12 + 1/7 + 1/4) = 1<BR>\n" );
document.write( "multiply both sides by 84:<BR>\n" );
document.write( "t(7 + 12 + 21) = 84<BR>\n" );
document.write( "t(40) = 84<BR>\n" );
document.write( "t = 2.1 hours<BR>\n" );
document.write( "or<BR>\n" );
document.write( "t = 2 hours and 6 minutes </SPAN>\n" );
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