document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=791864>Question 791864</A>: <I><SPAN STYLE=\"word-break: break-all;\"> one pipe can fill a swimming pool in 15 hours, a second pipe requires 18 hours. If the first pipe is opened for 7 hours and then closed when the second pipe is opened, how long will it take the second to finish filling the pool? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #479935 by </B><A HREF=/tutors/aboutme.mpl?userid=ankor@dixie-net.com><B>ankor@dixie-net.com(22740)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=ankor@dixie-net.com><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=ankor@dixie-net.com><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=479935\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\">  one pipe can fill a swimming pool in 15 hours, a second pipe requires 18 hours.<BR>\n" );
document.write( " If the first pipe is opened for 7 hours and then closed when the second pipe is opened, how long will it take the second to finish filling the pool?<BR>\n" );
document.write( ":<BR>\n" );
document.write( "Let t = time for the 2nd pipe to finish filling the pool<BR>\n" );
document.write( "Let the full pool = 1<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=7%2F15 ALIGN=MIDDLE  ALT=\"7%2F15\"   DISABLED_style= \"max-width:90%; height:auto;\" > + <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=t%2F18 ALIGN=MIDDLE  ALT=\"t%2F18\"   DISABLED_style= \"max-width:90%; height:auto;\" > = 1<BR>\n" );
document.write( "multiply by the LCM of 15 and 18, that's 90, results:<BR>\n" );
document.write( "90*<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=7%2F15 ALIGN=MIDDLE  ALT=\"7%2F15\"   DISABLED_style= \"max-width:90%; height:auto;\" > + 90*<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=t%2F18 ALIGN=MIDDLE  ALT=\"t%2F18\"   DISABLED_style= \"max-width:90%; height:auto;\" > = 90(1)<BR>\n" );
document.write( "cancel the denominators<BR>\n" );
document.write( "6(7) + 5t = 90<BR>\n" );
document.write( "5t = 90 - 42<BR>\n" );
document.write( "5t = 48<BR>\n" );
document.write( "t = 48/5<BR>\n" );
document.write( "t = 9.6 hrs </SPAN>\n" );
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