document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=318904>Question 318904</A>: <I><SPAN STYLE=\"word-break: break-all;\"> a plane flies 450 miles with the wind and 300 miles against the wind in the same length of time. if the speed of the wind is 20 mph, what is the speed of the plane in the air?<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 #228318 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=228318\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Let P be the plane speed.<BR>\n" );
document.write( "1.<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=%28P%2B20%29t=450 ALIGN=MIDDLE  ALT=\"%28P%2B20%29t=450\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "2.<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=%28P-20%29t=300 ALIGN=MIDDLE  ALT=\"%28P-20%29t=300\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "From eq. 1,<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=t=450%2F%28P%2B20%29 ALIGN=MIDDLE  ALT=\"t=450%2F%28P%2B20%29\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "Substitute in eq. 2,<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=%28P-20%29%2A%28450%2F%28P%2B20%29%29=300 ALIGN=MIDDLE  ALT=\"%28P-20%29%2A%28450%2F%28P%2B20%29%29=300\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=%28P-20%29%2A45=%28P%2B20%2930 ALIGN=MIDDLE  ALT=\"%28P-20%29%2A45=%28P%2B20%2930\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=45P-900=30P%2B600 ALIGN=MIDDLE  ALT=\"45P-900=30P%2B600\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=15P=1500 ALIGN=MIDDLE  ALT=\"15P=1500\"   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=100%29 ALIGN=MIDDLE  ALT=\"highlight%28P=100%29\"   DISABLED_style= \"max-width:90%; height:auto;\" > mph </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );