document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=233416>Question 233416</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A bathtub can be filled by the cold water faucet in 12 minutes and by the hot water faucet in 13 minutes.  How long does it take to fill the tub if both faucets are open? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #172285 by </B><A HREF=/tutors/aboutme.mpl?userid=stanbon><B>stanbon(75887)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=stanbon><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/images/nopicture.jpg><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=172285\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> A bathtub can be filled by the cold water faucet in 12 minutes and by the hot water faucet in 13 minutes. How long does it take to fill the tub if both faucets are open?<BR>\n" );
document.write( "----------------------------<BR>\n" );
document.write( "Cold water rate: 1/12 tub/min<BR>\n" );
document.write( "Hot water rate: 1/13 tub/min<BR>\n" );
document.write( "-----<BR>\n" );
document.write( "together rate = 1/x tub/min<BR>\n" );
document.write( "----------------<BR>\n" );
document.write( "Equation:<BR>\n" );
document.write( "rate + rate = together rate<BR>\n" );
document.write( "1/12 + 1/13 = 1/x<BR>\n" );
document.write( "(12+13)/(12*13) = 1/x<BR>\n" );
document.write( "x = (12*13)/(12+13)<BR>\n" );
document.write( "x = 6.24 minutes (time required to fill if both faucets are open)<BR>\n" );
document.write( "===================<BR>\n" );
document.write( "Cheers,<BR>\n" );
document.write( "Stan H. </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );