document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=431386>Question 431386</A>: <I><SPAN STYLE=\"word-break: break-all;\"> suppose that two pipes (A and B) can be used to fill a swimming pool. If both pipes are used together then it takes 25 hours to fill the pool.  If only pipe A is used then it takes 40 hours to fill the pool. If only Pipe B is used the it takes x hours to fill the pool. What formula can be used to find the answer? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #299400 by </B><A HREF=/tutors/aboutme.mpl?userid=mananth><B>mananth(16946)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=mananth><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=mananth><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=299400\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Filling the pool is 1 job									<BR>\n" );
document.write( "Pipe A + pipe B  takes	25	hours					<BR>\n" );
document.write( "So they will do	1/25of the job in 1 hour				<BR>\n" );
document.write( "Pipe A alone takes 40	hours						<BR>\n" );
document.write( "It does 1/40	of the job in 1 hour				<BR>\n" );
document.write( "If Pipe A does the job in x hours it does 1/x of the job in 1hour									<BR>\n" );
document.write( "1/25-1/40=1/x	<BR>\n" );
document.write( "LCD =	200								<BR>\n" );
document.write( "(8-5)/200=1/x	<BR>\n" );
document.write( "3/200=1/x					<BR>\n" );
document.write( "Cross multiply									<BR>\n" );
document.write( "3x=200						<BR>\n" );
document.write( "x=67 hours						<BR>\n" );
document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );