document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=428102>Question 428102</A>: <I><SPAN STYLE=\"word-break: break-all;\"> one pump can drain a pool in 12 minutes. when a second pump is also used the pool only takes 9 minutes to drain.how long would it take the second pump to drain the pool if it were the only pump </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #297643 by </B><A HREF=/tutors/aboutme.mpl?userid=htmentor><B>htmentor(1343)</B></A><img src=\"/images/stars/stars-12.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=htmentor><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=htmentor><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=297643\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> The pumping rate of the 1st pump = 1 pool per 12 min.<BR>\n" );
document.write( "With both pumps working together, the combined pumping rate is 1 pool per 9 min.<BR>\n" );
document.write( "So, in 9 minutes, the 1st pump pumped 1/12 * 9 min. = 9/12 = 3/4 of the pool<BR>\n" );
document.write( "That means the 2nd pump pumped out 1/4 of the pool in 9 minutes.<BR>\n" );
document.write( "So the time required for the 2nd pump to pump out the whole pool is 9*4 = 36 minutes.<BR>\n" );
document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );