document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=316396>Question 316396</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A plane travesl 880 miles in 4 hours against the wind and 1000 miles in 2 hours with the same wind.  Find the speed of the plane in still air and 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 #226315 by </B><A HREF=/tutors/aboutme.mpl?userid=mananth><B>mananth(16949)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=mananth><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=mananth><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=226315\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> let speed in still air be x<BR>\n" );
document.write( "Let speed of wind be y<BR>\n" );
document.write( "..<BR>\n" );
document.write( "speed against wind = x-y<BR>\n" );
document.write( "distance traveled = 880 miles<BR>\n" );
document.write( "Time taken = 4 hours<BR>\n" );
document.write( "speed = 880/4 = 220 mph<BR>\n" );
document.write( "x-y =220<BR>\n" );
document.write( "..<BR>\n" );
document.write( "with wind 1000 miles<BR>\n" );
document.write( "time = 2 hours<BR>\n" );
document.write( "speed = 500 mph<BR>\n" );
document.write( "x+y=500<BR>\n" );
document.write( "..<BR>\n" );
document.write( "Add the two equations<BR>\n" );
document.write( "x-y+x+y=720<BR>\n" );
document.write( "2x=720<BR>\n" );
document.write( "x=360 mph speed of plane in still air<BR>\n" );
document.write( "x-y=220<BR>\n" );
document.write( "plug the value of x in the equation<BR>\n" );
document.write( "y=140 mph wind speed </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );