document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=724220>Question 724220</A>: <I><SPAN STYLE=\"word-break: break-all;\"> An airplane took 4 hours to fly 600 miles against head wind. The return trip with same wind took one hour. find speed of plane in still air. I have tried d=rt , it didnt work and mutiple formulas and can't figure it out. I would appreciate the help. Thank you. </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #443647 by </B><A HREF=/tutors/aboutme.mpl?userid=lwsshak3><B>lwsshak3(11628)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=lwsshak3><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=443647\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> An airplane took 4 hours to fly 600 miles against head wind. The return trip with same wind took one hour. find speed of plane in still air.<BR>\n" );
document.write( "***<BR>\n" );
document.write( "let x= speed of plane in still air<BR>\n" );
document.write( "let c= speed of wind<BR>\n" );
document.write( "x+c=speed of plane downwind<BR>\n" );
document.write( "x-c= speed of plane against the wind<BR>\n" );
document.write( "travel time=distance/speed<BR>\n" );
document.write( "..<BR>\n" );
document.write( "600/(x-c)=4<BR>\n" );
document.write( "600/(x+c)=1<BR>\n" );
document.write( "..<BR>\n" );
document.write( "600=4x-4c<BR>\n" );
document.write( "600=x+c<BR>\n" );
document.write( "..<BR>\n" );
document.write( "600=4x-4c<BR>\n" );
document.write( "2400=4x+4c<BR>\n" );
document.write( "add<BR>\n" );
document.write( "3000=8x<BR>\n" );
document.write( "x=375<BR>\n" );
document.write( "speed of plane in still air=375 mph<BR>\n" );
document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );