document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=292091>Question 292091</A>: <I><SPAN STYLE=\"word-break: break-all;\"> It takes Sal 5 hours to paint a house. It takes Tom 3 hours to paint the same house.  How long will it take to paint the house if both of them work together? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #211088 by </B><A HREF=/tutors/aboutme.mpl?userid=Alan3354><B>Alan3354(69443)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=Alan3354><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=Alan3354><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=211088\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> It takes Sal 5 hours to paint a house. It takes Tom 3 hours to paint the same house. How long will it take to paint the house if both of them work together?<BR>\n" );
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document.write( "If you add the hours, it's 8 hours.  Doesn't seem right, unless they drink a lot of beer and watch TV.<BR>\n" );
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document.write( "Use the reciprocals, then you can add them.<BR>\n" );
document.write( "Sal does 1/5 of the house per hour.<BR>\n" );
document.write( "Tom does 1/3 per hour.<BR>\n" );
document.write( "Together, they do 1/5 + 1/3 per hour = 8/15<BR>\n" );
document.write( "8/15 house per hour --> 15/8 hours per house.<BR>\n" );
document.write( "15/8 is it, or 1.875 hours.<BR>\n" );
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document.write( "There's a shortcut, product/sum<BR>\n" );
document.write( "3*5/(3+5) = 15/8<BR>\n" );
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