document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=103462>Question 103462</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Word problems are not my stong suit...please help.\r<BR>\n" );
document.write( "\n" );
document.write( "A plane flies 720 mi against a steady 30-mi/hr headwind and then returns to the same point with the wind.  If the entire trip takes 10 h., what is the plane's 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 #75229 by </B><A HREF=/tutors/aboutme.mpl?userid=checkley75><B>checkley75(3666)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=checkley75><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=75229\">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+600+720x-600/(x^2-900)=10<BR>\n" );
document.write( "1440x/(x^2-900)=10 cross multiply<BR>\n" );
document.write( "1440x=10x^2-9000<BR>\n" );
document.write( "10x^2-1440x-9000=0<BR>\n" );
document.write( "10(x^2-144-900)=0<BR>\n" );
document.write( "10(x-150)(x+6)=0<BR>\n" );
document.write( "x-150=0<BR>\n" );
document.write( "x=150 mph for the plane.<BR>\n" );
document.write( "proof<BR>\n" );
document.write( "720/(150-30)+720/(150+30)=10<BR>\n" );
document.write( "720/120+720/180=10<BR>\n" );
document.write( "6+4=10<BR>\n" );
document.write( "10=10\r<BR>\n" );
document.write( "\n" );
document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );