document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1163560>Question 1163560</A>: <I><SPAN STYLE=\"word-break: break-all;\"> a new type of pump can drain a pool in 6 hours. an older pump can drain the pool in 12 hours. how long will it take both pumps working together to drain 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 #787694 by </B><A HREF=/tutors/aboutme.mpl?userid=greenestamps><B>greenestamps(13203)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=greenestamps><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=greenestamps><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=787694\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> <br><BR>\n" );
document.write( "Another quick mental solution method -- very similar to, yet much different than, the one shown by tutor @ikleyn.<br><BR>\n" );
document.write( "In 12 hours, the new pump could drain the pool 2 times -- or, more reasonably, it could drain 2 of the pools.<BR>\n" );
document.write( "In the same 12 hours, the old pump can drain the pool once.<BR>\n" );
document.write( "So together in 12 hours the two pumps could drain 3 of the pools.<BR>\n" );
document.write( "And therefore the two together can drain the one pool in 12/3 = 4 hours.<br><BR>\n" );
document.write( "That's the same logic as used in tutor @ikleyn's mental solution; but the thought process is a bit different.<br><BR>\n" );
document.write( "Try both methods to see if one or the other \"works\" better for you.<br><BR>\n" );
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