document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=906390>Question 906390</A>: <I><SPAN STYLE=\"word-break: break-all;\"> It takes Ralph 10 hours to paint a fence alone. Lisa can do the same job in 14 hours. If Ralph paints alone for 30 minutes before Lisa begins helping, how long must they work together to finish painting the fence? Give your answer as a simplified fraction </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #549786 by </B><A HREF=/tutors/aboutme.mpl?userid=richwmiller><B>richwmiller(17219)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=richwmiller><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=richwmiller><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=549786\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> x/a+x/b=1<BR>\n" );
document.write( ".5/10+x/10+x/14=1<BR>\n" );
document.write( "3.5/70+7x/70+5x/70=1\r<BR>\n" );
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document.write( "12x/70=66.5/70<BR>\n" );
document.write( "12x=66.5<BR>\n" );
document.write( "x=66.5/12<BR>\n" );
document.write( "x=5 6.5/12<BR>\n" );
document.write( "or <BR>\n" );
document.write( "x=5.5417 hrs<BR>\n" );
document.write( "5 hr 32 minutes 30.12 seconds\r<BR>\n" );
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document.write( "if they had started together it would be x=5.83 hours </SPAN>\n" );
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