document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=741947>Question 741947</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, what is 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 #452211 by </B><A HREF=/tutors/aboutme.mpl?userid=stanbon><B>stanbon(75887)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=stanbon><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/images/nopicture.jpg><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=452211\">put this solution on YOUR website!</A><BR><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, what is the speed of the plane in still air?<BR>\n" );
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document.write( "Equations:<BR>\n" );
document.write( "p + w = 500 mph<BR>\n" );
document.write( "p - w = 420 mph<BR>\n" );
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document.write( "Add and solve for \"p\":<BR>\n" );
document.write( "2p = 920<BR>\n" );
document.write( "plane speed = 460 mph<BR>\n" );
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document.write( "Solve for \"w\":<BR>\n" );
document.write( "p + w = 500<BR>\n" );
document.write( "460 + w = 500<BR>\n" );
document.write( "wind speed = 40 mph<BR>\n" );
document.write( "===============================<BR>\n" );
document.write( "Cheers,<BR>\n" );
document.write( "Stan H. </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );