document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=311140>Question 311140</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A plane flies 900 miles with a tail wind in 3 hours. It rakes the same plane 4 hours to fly the 900 miles flying against the tail wind. What is the planes speed 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 #222537 by </B><A HREF=/tutors/aboutme.mpl?userid=Alan3354><B>Alan3354(69443)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=Alan3354><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=Alan3354><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=222537\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\">  A plane flies 900 miles with a tail wind in 3 hours. It rakes the same plane 4 hours to fly the 900 miles flying against the tail wind. What is the planes speed in still air?<BR>\n" );
document.write( "-----------------------<BR>\n" );
document.write( "A tailwind is wind going the same direction as the plane, sometimes called \"flying with the wind.\"  You don't fly against a tailwind.<BR>\n" );
document.write( "Flying into the wind is called a headwind, of flying against the wind (as Bob Seger mentioned).<BR>\n" );
document.write( "Also, the \"plane's speed is still air\" is called airspeed.<BR>\n" );
document.write( "--------------------------<BR>\n" );
document.write( "900/3 = 300 mph<BR>\n" );
document.write( "900/4 = 225 mph<BR>\n" );
document.write( "The airspeed is the average, (300 + 225)/2 = 262.5 mph<BR>\n" );
document.write( "---------------------<BR>\n" );
document.write( "The wind speed is the difference, = 300 - 262.5 = 37.5 mph (it wasn't asked for)<BR>\n" );
document.write( "-------------------<BR>\n" );
document.write( "BTW, planes use knots for speed, not miles per hour.<BR>\n" );
document.write( "People writing books should stick to what they know, if they know anything.<BR>\n" );
document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );