document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1097855>Question 1097855</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Bob and Sarah need to paint a fence. Bob can paint a fence in 4 hours and Sarah can paint a fence in 2.5 hours. If they work together, how long will it take them to paint the fence? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #712272 by </B><A HREF=/tutors/aboutme.mpl?userid=addingup><B>addingup(3677)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=addingup><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=addingup><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=712272\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Bob: in 4 hours 1 fence, in 1 hour 1/4 fence<BR>\n" );
document.write( "Sarah: 2.5 hrs to paint the fence, in 1 hour 1/2.5<BR>\n" );
document.write( "1/4+1/2.5 = 5/20+8/20 = 13/20<BR>\n" );
document.write( "-------------------------------------------<BR>\n" );
document.write( "Ok, now let's call the time it will take them together t:<BR>\n" );
document.write( "They will do 1 fence in t time: 1/t. Flip the equation and you get:<BR>\n" );
document.write( "1/t = t/1 = 20/13 = 1 hour and 7/13 minutes = or 1 hour and 32.31 minutes or 1 hour 32 minutes and 19 seconds<BR>\n" );
document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );