document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=540909>Question 540909</A>: <I><SPAN STYLE=\"word-break: break-all;\"> If a plane can travel 500 miles per hour with the wind and 420 miles per hour against the wind, find the speed of the plane in still air. </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #353905 by </B><A HREF=/tutors/aboutme.mpl?userid=Theo><B>Theo(13342)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=Theo><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=Theo><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=353905\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> p = speed of plane<BR>\n" );
document.write( "w = speed of wind<BR>\n" );
document.write( "p + w = 500 mph (traveling with the wind)<BR>\n" );
document.write( "p - w = 420 mph (travfeling against the wind)<BR>\n" );
document.write( "add these 2 equations together and you get:<BR>\n" );
document.write( "2p = 920<BR>\n" );
document.write( "divide both sides by 2 to get:<BR>\n" );
document.write( "p = 460 mph.<BR>\n" );
document.write( "this means that w = 40 mph.<BR>\n" );
document.write( "with the wind, the speed is 460 mph for the plane plus 40 mph for the wind which equals a total of 500 mph.<BR>\n" );
document.write( "against the wind, the speed is 460 mph for the plane minus 40 mph for the wind which equals a total of 420 mph.<BR>\n" );
document.write( "number check out.<BR>\n" );
document.write( "your answer is:<BR>\n" );
document.write( "speed of the plane is 460 mph.<BR>\n" );
document.write( "speed of the wind is 40 mph. </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );