document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=26709>Question 26709</A>: <I><SPAN STYLE=\"word-break: break-all;\"> With a tailwind, a plane can fly 450 miles in 3 hours.  The return trip takes 5 hours  Find the speed of ther plane in still air and the speed of the wind. </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #14510 by </B><A HREF=/tutors/aboutme.mpl?userid=Paul><B>Paul(988)</B></A><img src=\"/images/stars/stars-11.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=Paul><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=14510\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Let the speed of the plane  be x<BR>\n" );
document.write( "Let the speed of the wind be y<BR>\n" );
document.write( "3(x+y)=450---------->3x+3y=450<BR>\n" );
document.write( "Solve for y<BR>\n" );
document.write( "3y=450-3x<BR>\n" );
document.write( "y=150-x (subsituion)\r<BR>\n" );
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document.write( "Second equation:<BR>\n" );
document.write( "5(x-y)=450 ----->5x-5y=450 (use subsitution)<BR>\n" );
document.write( "5x-5(150-x)=450<BR>\n" );
document.write( "5x+5x-750=450<BR>\n" );
document.write( "10x=1200<BR>\n" );
document.write( "x=120\r<BR>\n" );
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document.write( "3(120)+3y=450<BR>\n" );
document.write( "360+3y=450<BR>\n" );
document.write( "3y=90<BR>\n" );
document.write( "y=30\r<BR>\n" );
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document.write( "Hence, the speed of the plane is 120mph and the speed of the wind is 30mph.<BR>\n" );
document.write( "Paul.<BR>\n" );
document.write( " </SPAN>\n" );
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