document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=99510>Question 99510</A>: <I><SPAN STYLE=\"word-break: break-all;\"> 2 pumps-<BR>\n" );
document.write( "1 fills a tank in 5 hours<BR>\n" );
document.write( "1 fills a tank in 7 hours--<BR>\n" );
document.write( "how many hours to fill the tank with both pumps filling it at the same time?<BR>\n" );
document.write( "how did you come up with the answer?<BR>\n" );
document.write( "thanks...<BR>\n" );
document.write( " </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #72372 by </B><A HREF=/tutors/aboutme.mpl?userid=stanbon><B>stanbon(75887)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=stanbon><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/images/nopicture.jpg><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=72372\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> 2 pumps-<BR>\n" );
document.write( "1 fills a tank in 5 hours<BR>\n" );
document.write( "1 fills a tank in 7 hours--<BR>\n" );
document.write( "how many hours to fill the tank with both pumps filling it at the same time?<BR>\n" );
document.write( "--------------<BR>\n" );
document.write( "1st tank DATA;<BR>\n" );
document.write( "Time + 5 hr/job ; Rate = 1/5 job/hr<BR>\n" );
document.write( "------------------<BR>\n" );
document.write( "2nd tank DATA:<BR>\n" );
document.write( "time = 7 hr/job ; Rate = 1/7 job/hr<BR>\n" );
document.write( "--------------------------------<BR>\n" );
document.write( "Together DATA:<BR>\n" );
document.write( "time = x hr/job ; Rate = 1/x job/hr<BR>\n" );
document.write( "-----------------------<BR>\n" );
document.write( "EQUATION:<BR>\n" );
document.write( "rate + rate = together rate<BR>\n" );
document.write( "1/5 + 1/7 = 1/x<BR>\n" );
document.write( "Multiply thru by 35x to get:<BR>\n" );
document.write( "7x + 5x = 35<BR>\n" );
document.write( "12x = 35 <BR>\n" );
document.write( "x = 35/12 = 3 11/12 hr = 3 hr 55 minutes (time to do the job together)<BR>\n" );
document.write( "==========================<BR>\n" );
document.write( "Cheers,<BR>\n" );
document.write( "Stan H.<BR>\n" );
document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );