document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=65580>Question 65580</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A plane flies 720mi agains a steady 30-mi/h headwind and then returns to the same point with the wind. If the entire trip takes 10h, what is the plane's speed in still air?<BR>\n" );
document.write( "Thank you so much </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #46204 by </B><A HREF=/tutors/aboutme.mpl?userid=checkley71><B>checkley71(8403)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=checkley71><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=46204\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> 720/(X+30)+720/(X-30)=10<BR>\n" );
document.write( "[720(X-30)+720(X+30)]/(X+30)(X-30)=10<BR>\n" );
document.write( "(720X-21600+720X+21600)/X^2-900=10<BR>\n" );
document.write( "1440X/X^2-900=10<BR>\n" );
document.write( "10X^2-9000=1440X<BR>\n" );
document.write( "10X^2-1440X-9000=0<BR>\n" );
document.write( "X^2-144X-900=0<BR>\n" );
document.write( "(x-150)(x+6)=0<BR>\n" );
document.write( "x-150=0<BR>\n" );
document.write( "x=150 mph for the plane in still air.<BR>\n" );
document.write( "proof<BR>\n" );
document.write( "720/180+720/120)=10<BR>\n" );
document.write( "4+6=10<BR>\n" );
document.write( "10=10<BR>\n" );
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document.write( "MERRY CHRISTMAS  </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );