document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=184911>Question 184911</A>: <I><SPAN STYLE=\"word-break: break-all;\"> an airplane flew for 5 hours with a tail wind of 25 km/h. <BR>\n" );
document.write( "the return flight against the same wind took 5.5 hours.<BR>\n" );
document.write( "find the speed of the airplane in still air. </SPAN>\n" );
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document.write( "THE DISTANCES ARE THE SAME THUS:<BR>\n" );
document.write( "RT=RT<BR>\n" );
document.write( "(X+25)5=(X-25)5.5<BR>\n" );
document.write( "5X+125=5.5X-137.5<BR>\n" );
document.write( "5X-5.5X=-137.5-125<BR>\n" );
document.write( "-.5X=-262.5<BR>\n" );
document.write( "X=-262.5/-.5<BR>\n" );
document.write( "X=525 MPH IS THE PLANE SPEED IN STILL AIR.\r<BR>\n" );
document.write( "\n" );
document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );