document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=154284>Question 154284</A>: <I><SPAN STYLE=\"word-break: break-all;\"> I've tried to figure out what to use but for some reason it hasnt come to me.\r<BR>\n" );
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document.write( "Please help me solve this equation: Two pipes are used to fill a water storage tank. The first pipe can fill the tank in 4 hours, and the two pipes together can fill the tank in 2 hours less time than the second pipe alone. How long would it take for the second pipe 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 #113602 by </B><A HREF=/tutors/aboutme.mpl?userid=scott8148><B>scott8148(6628)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=scott8148><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=scott8148><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=113602\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> let s=\"second pipe alone\"\r<BR>\n" );
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document.write( "each pipe fills some fraction of the tank<BR>\n" );
document.write( "__ the fraction is (combined time)/(time alone)<BR>\n" );
document.write( "__ the fractions add to the whole, 1\r<BR>\n" );
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document.write( "eg. if you can do a task in 6 hrs; when you work in a group that takes 2 hrs, you do 1/3 of the task (2/6)\r<BR>\n" );
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document.write( "(s-2)/4 + (s-2)/s = 1 __ multiplying by 4s __ s^2-2s+4s-8=4s\r<BR>\n" );
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document.write( "subtracting 4s __ s^2-2s-8=0 __ factoring __ (s-4)(s+2)=0\r<BR>\n" );
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document.write( "s-4=0 __ s=4 __ same as 1st pipe\r<BR>\n" );
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document.write( "s+2=0 __ s=-2 __ negative value not realistic </SPAN>\n" );
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