document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=163446>Question 163446</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Can you help me solve this problem: A plane that can fly 340 mph in still air can fly 200 miles downwind in the same amount of time that it can fly 140 miles upwind. Find the velocity 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 #120405 by </B><A HREF=/tutors/aboutme.mpl?userid=checkley77><B>checkley77(12844)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=checkley77><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=120405\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> 200/(340+r)=t<BR>\n" );
document.write( "140/(340-r)=t<BR>\n" );
document.write( "200/(340+r)=140/(340-r)<BR>\n" );
document.write( "140(340+r)=200(340-r)<BR>\n" );
document.write( "47,600+140r=68,000-200r<BR>\n" );
document.write( "140r+200r=68,000-47,600<BR>\n" );
document.write( "340r=20,400<BR>\n" );
document.write( "r=20,400/340<BR>\n" );
document.write( "r=60 mph is the speed of the wind.<BR>\n" );
document.write( "Proof<BR>\n" );
document.write( "200/(340+60)=(140/(340-60)<BR>\n" );
document.write( "200/400=140/280<BR>\n" );
document.write( "1/2=1/2\r<BR>\n" );
document.write( "\n" );
document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );