document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=576149>Question 576149</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Without any wind an airplane flies at 200 miles per hour.  It travels 800 miles into the wind and then returns with the wind in a total time of 8 hours and 20 minutes.  Find the average 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 #369745 by </B><A HREF=/tutors/aboutme.mpl?userid=mananth><B>mananth(16946)</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=369745\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Plane  	speed	=	200	m/h														<BR>\n" );
document.write( "Wind   	speed	=	x	m/h														<BR>\n" );
document.write( "																		<BR>\n" );
document.write( "against wind =200-x													<BR>\n" );
document.write( "with wind  =200	+x 													<BR>\n" );
document.write( "																		<BR>\n" );
document.write( "Total distance =800	miles	Total Time=	8.30	hours  											<BR>\n" );
document.write( "Time upstream + time downstream =8.3 hours																		<BR>\n" );
document.write( "																		<BR>\n" );
document.write( "800/(200-x)+800/(200+x)=8.3						<BR>\n" );
document.write( "800(200	+x)+800	(200-x)=8.30(40000-X^2	)<BR>\n" );
document.write( "160000+	800x+160000-800x=332000	-8.3X^2						<BR>\n" );
document.write( "320000	--332000=-8.3	X^2											<BR>\n" );
document.write( "12000	=8.3	X^2														<BR>\n" );
document.write( "	<BR>\n" );
document.write( "x=<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=sqrt%2812000%09%2F8.3%29 ALIGN=MIDDLE  ALT=\"sqrt%2812000%09%2F8.3%29\"   DISABLED_style= \"max-width:90%; height:auto;\" >												<BR>\n" );
document.write( "x=	38.02	mph															<BR>\n" );
document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );