document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=945891>Question 945891</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A 600 mile trip from one city to another takes 4 hours when the plane is flying with the wind. The return trip against the wind takes 5 hours. Find the rate of the plane in still air and the rate of the wind. </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #576995 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=576995\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> x = speed of airplane in still air (mph)<BR>\n" );
document.write( "y = speed of the wind (mph)<BR>\n" );
document.write( "---<BR>\n" );
document.write( "s = d/t<BR>\n" );
document.write( "---<BR>\n" );
document.write( "downwind:<BR>\n" );
document.write( "x + y = 600/4<BR>\n" );
document.write( "x + y = 150<BR>\n" );
document.write( "---<BR>\n" );
document.write( "upwind:<BR>\n" );
document.write( "x - y = 600/5<BR>\n" );
document.write( "x - y = 120<BR>\n" );
document.write( "---<BR>\n" );
document.write( "put the system of linear equations into standard form<BR>\n" );
document.write( "---<BR>\n" );
document.write( "x + y = 150<BR>\n" );
document.write( "x - y = 120<BR>\n" );
document.write( "---<BR>\n" );
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document.write( "---<BR>\n" );
document.write( "solution:<BR>\n" );
document.write( "x = 135<BR>\n" );
document.write( "y = 15<BR>\n" );
document.write( "---<BR>\n" );
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document.write( "--- </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );