document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=604634>Question 604634</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Please help me with this problem:<BR>\n" );
document.write( "A plane flies 900 miles with a tail wind in 3 hours. It takes the same plane 5 hours to fly the 900 miles flying against the wind. What is the plane's speed 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 #381314 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=381314\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> A plane flies 900 miles with a tail wind in 3 hours. It takes the same plane 5 hours to fly the 900 miles flying against the wind. What is the plane's speed 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 wind<BR>\n" );
document.write( "distance=travel time*speed<BR>\n" );
document.write( "..<BR>\n" );
document.write( "5(x-c)=900<BR>\n" );
document.write( "3(x+c)=900<BR>\n" );
document.write( "..<BR>\n" );
document.write( "5x-5c=900<BR>\n" );
document.write( "3x+3c=900<BR>\n" );
document.write( "..<BR>\n" );
document.write( "15x-15c=2700 (multi. by 3)<BR>\n" );
document.write( "15x+15c=4500 (multi. by 5)<BR>\n" );
document.write( "add<BR>\n" );
document.write( "30x=7200<BR>\n" );
document.write( "x=240<BR>\n" );
document.write( "5c=5x-900=300<BR>\n" );
document.write( "c=60<BR>\n" );
document.write( "ans:<BR>\n" );
document.write( "speed of plane in still air=240 mph<BR>\n" );
document.write( "speed of wind=60 mph </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );