document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=38574>Question 38574</A>: <I><SPAN STYLE=\"word-break: break-all;\"> It takes Tom 4 hours to build a fence. If he hires Jack to help him, together they can do the job in just 3 hours. If jack built the same fence by himself, how long would it take him??\r<BR>\n" );
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document.write( "Thanks for answering!:-) </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #24112 by </B><A HREF=/tutors/aboutme.mpl?userid=fractalier><B>fractalier(6550)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=fractalier><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=fractalier><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=24112\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> We use the work problem formula<BR>\n" );
document.write( "t/A + t/B = 1<BR>\n" );
document.write( "t = time worked together<BR>\n" );
document.write( "A = first guy's time alone<BR>\n" );
document.write( "B = second guy's time alone<BR>\n" );
document.write( "1 = one job or task<BR>\n" );
document.write( "so plug in and get<BR>\n" );
document.write( "3/4 + 3/B = 1<BR>\n" );
document.write( "multiply all by 4B and get<BR>\n" );
document.write( "3B + 12 = 4B<BR>\n" );
document.write( "and <BR>\n" );
document.write( "B = 12 hours </SPAN>\n" );
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