document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=967240>Question 967240</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A certain aircraft can fly 756 miles with the wind in 3 hours and travel the same distance against the wind in 7 hours. What is the speed of the wind </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #591395 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=591395\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> A certain aircraft can fly 756 miles with the wind in 3 hours and travel the same distance against the wind in 7 hours. What is the speed of the wind<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 with the wind<BR>\n" );
document.write( "(x-c)=speed of plane against the wind<BR>\n" );
document.write( "travel time*speed=distance <BR>\n" );
document.write( "..<BR>\n" );
document.write( "3(x+c)=756<BR>\n" );
document.write( "7(x-c)=756<BR>\n" );
document.write( "..<BR>\n" );
document.write( "3x+3c=756<BR>\n" );
document.write( "7x-7c=756<BR>\n" );
document.write( "..<BR>\n" );
document.write( "21x+21c=5292<BR>\n" );
document.write( "21x-21c=2268<BR>\n" );
document.write( "subtract<BR>\n" );
document.write( "42c=3024<BR>\n" );
document.write( "c=72<BR>\n" );
document.write( "What is the speed of the wind? 72 mph </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );