document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=435797>Question 435797</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A pool can be filled by one pipe in 12 hours and by a second pipe in 36 hours. How long will it take using both pipes to fill the pool? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #301581 by </B><A HREF=/tutors/aboutme.mpl?userid=htmentor><B>htmentor(1343)</B></A><img src=\"/images/stars/stars-12.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=htmentor><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=htmentor><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=301581\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> The fill rate of pipe 1 = 1/12 pool/hr, and the fill rate of pool 2 = 1/36 pool/hr.<BR>\n" );
document.write( "Working together, their combined rate is:<BR>\n" );
document.write( "1/12 + 1/36 = 3/36 + 1/36 = 4/36 pool/hr<BR>\n" );
document.write( "Taking the reciprocal gives 36/4 = 9 hr/pool<BR>\n" );
document.write( "Ans: 9 hours </SPAN>\n" );
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