document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=923884>Question 923884</A>: <I><SPAN STYLE=\"word-break: break-all;\"> a tank can be filled in 3 hours with a pipe.It can be filled in 5 hours with another pipe and it can be drained (if full) in 7 hrs by an emergency valve.How many hours will it take to fill the tank if both the pipes and the emergency valve are opened simultaneously?\r<BR>\n" );
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document.write( "a)4.32<BR>\n" );
document.write( "b)3.52<BR>\n" );
document.write( "c)2.56<BR>\n" );
document.write( "D)none </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #560431 by </B><A HREF=/tutors/aboutme.mpl?userid=TimothyLamb><B>TimothyLamb(4379)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=TimothyLamb><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=TimothyLamb><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=560431\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> rate = v/t<BR>\n" );
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document.write( "x = pipe-1 rate = v/3<BR>\n" );
document.write( "y = pipe-2 rate = v/5<BR>\n" );
document.write( "z = drain rate = v/7<BR>\n" );
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document.write( "x + y + z = v/3 + v/5 - v/7<BR>\n" );
document.write( "x + y + z = 5*7v/3*5*7 + 3*7v/3*5*7 - 3*5v/3*5*7<BR>\n" );
document.write( "x + y + z = 35v/105 + 21v/105 - 15v/105<BR>\n" );
document.write( "x + y + z = 41v/105<BR>\n" );
document.write( "x + y + z = (41/41)v/(105/41)<BR>\n" );
document.write( "x + y + z = v/(105/41)<BR>\n" );
document.write( "x + y + z = rate = v/t = v/(105/41)<BR>\n" );
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document.write( "t = 105/41<BR>\n" );
document.write( "t = 2.561 hours<BR>\n" );
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document.write( "answer:<BR>\n" );
document.write( "c)2.56<BR>\n" );
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document.write( "Solve and graph linear equations:<BR>\n" );
document.write( "https://sooeet.com/math/linear-equation-solver.php<BR>\n" );
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document.write( "Solve quadratic equations, quadratic formula:<BR>\n" );
document.write( "https://sooeet.com/math/quadratic-formula-solver.php<BR>\n" );
document.write( "---<BR>\n" );
document.write( "Convert fractions, decimals, and percents:<BR>\n" );
document.write( "https://sooeet.com/math/fraction-decimal-percent.php<BR>\n" );
document.write( "---<BR>\n" );
document.write( "Calculate and graph the linear regression of any data set:<BR>\n" );
document.write( "https://sooeet.com/math/linear-regression.php<BR>\n" );
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