document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=318962>Question 318962</A>: <I><SPAN STYLE=\"word-break: break-all;\"> An airplane flies 840 mi in 3 hours with a tail wind. The return trip at the same airspeed takes 3.5 hours. Find the wind speed and the airspeed. </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #228372 by </B><A HREF=/tutors/aboutme.mpl?userid=Fombitz><B>Fombitz(32388)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=Fombitz><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=Fombitz><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=228372\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Rate*Time=Distance<BR>\n" );
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document.write( "Let P be the plane speed, W the wind speed.<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=%28P%2BW%293=840 ALIGN=MIDDLE  ALT=\"%28P%2BW%293=840\"   DISABLED_style= \"max-width:90%; height:auto;\" ><--- with the wind<BR>\n" );
document.write( "1.<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=P%2BW=280 ALIGN=MIDDLE  ALT=\"P%2BW=280\"   DISABLED_style= \"max-width:90%; height:auto;\" >mph<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=%28P-W%293.5=840 ALIGN=MIDDLE  ALT=\"%28P-W%293.5=840\"   DISABLED_style= \"max-width:90%; height:auto;\" ><--- against the wind<BR>\n" );
document.write( "2.<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=P-W=240 ALIGN=MIDDLE  ALT=\"P-W=240\"   DISABLED_style= \"max-width:90%; height:auto;\" >mph<BR>\n" );
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document.write( "Add eq. 1 and eq. 2 to eliminate W,<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=P%2BW%2BP-W=280%2B240 ALIGN=MIDDLE  ALT=\"P%2BW%2BP-W=280%2B240\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=2P=520 ALIGN=MIDDLE  ALT=\"2P=520\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=highlight%28P=260%29 ALIGN=MIDDLE  ALT=\"highlight%28P=260%29\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "Then use either equation to solve for W,<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=260%2BW=280 ALIGN=MIDDLE  ALT=\"260%2BW=280\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=highlight%28W=20%29 ALIGN=MIDDLE  ALT=\"highlight%28W=20%29\"   DISABLED_style= \"max-width:90%; height:auto;\" > </SPAN>\n" );
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