document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1170057>Question 1170057</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Flying against the jetstream, a jet travels 5220 miles in 9 hours. Flying with the jetstream, the same jet travels 6120 miles in 6 hours. What is the rate of the jet in still air and what is the rate of the jetstream? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #794935 by </B><A HREF=/tutors/aboutme.mpl?userid=greenestamps><B>greenestamps(13200)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=greenestamps><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/cgi-bin/show-face.mpl?user=greenestamps><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=794935\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> <br><BR>\n" );
document.write( "(1) Find the speed A with the jet stream by dividing distance by time; find the speed B against the jet stream the same way.<br><BR>\n" );
document.write( "(2) The speed A is the speed of the plane plus the speed of the jet stream; the speed B is the speed of the plane minus the speed of the jet stream.  That means the speed of the plane is the average of A and B (i.e., halfway between A and B); and then the speed of the jet stream is the difference between the speed of the plane and either A or B.<br><BR>\n" );
document.write( "An example, in case the words are hard to follow:<br><BR>\n" );
document.write( "speed with the jet stream: A = 400<BR>\n" );
document.write( "speed against the jet stream: B = 320<BR>\n" );
document.write( "speed of plane: halfway between A and B: 360<BR>\n" );
document.write( "speed of jet stream: difference between 360 and either A or B: 400-360 = 40, or 360-320 = 40<br><BR>\n" );
document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );