document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=4969>Question 4969</A>: <I><SPAN STYLE=\"word-break: break-all;\"> an airplane flew for 4.23 hours with a 25.5-km/h tail wind. the return flight against the same wind took 4.97 hours. find the speed of the plain 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 #2474 by </B><A HREF=/tutors/aboutme.mpl?userid=Abbey><B>Abbey(339)</B></A><img src=\"/images/stars/stars-10.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=Abbey><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=2474\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> let the rate of airplane on the trip going = x+25.5km<BR>\n" );
document.write( "Let the rate returning =x-25.5km <BR>\n" );
document.write( "the distance is the same both ways,<BR>\n" );
document.write( "using rate*time=distance, we have two equations:<BR>\n" );
document.write( "(x+25.5)*4.23=d<BR>\n" );
document.write( "(x-25.5)*4.97=d<BR>\n" );
document.write( "Set them equal to one another,<BR>\n" );
document.write( "(x+25.5)*4.23= (x-25.5)*4.97\r<BR>\n" );
document.write( "\n" );
document.write( "4.23x+107.865=4.97x-126.735<BR>\n" );
document.write( "subtract 4.23x and add 126.735 to both sides:\r<BR>\n" );
document.write( "\n" );
document.write( "234.6=.74x<BR>\n" );
document.write( "divide by .74\r<BR>\n" );
document.write( "\n" );
document.write( "317.027=x <BR>\n" );
document.write( "the airplane traveled 317.02kmh in still air.<BR>\n" );
document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );