document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=213770>Question 213770</A>This question is from textbook <A HREF=http://www.amazon.com/exec/obidos/ASIN/0395977223/algebrahomeworkh>Structure and Method Book 1</A><BR>\n" );
document.write( ": <I><SPAN STYLE=\"word-break: break-all;\"> An ultra light aircraft flies to a nearby town that is 20 miles away in 2/5 hour with a tail wind. It can fly back home again when fighting a head wind in 1/2 hour. Find the air speed of the ultra light aircraft and the wind speed. Check your answer </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #161499 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=161499\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> D=RT<BR>\n" );
document.write( "20=R*.4<BR>\n" );
document.write( "20=.4R<BR>\n" );
document.write( "R=20/.4<BR>\n" );
document.write( "R=50 MPH. WITH THE WIND.<BR>\n" );
document.write( "20R=R*.5<BR>\n" );
document.write( ".5R=20<BR>\n" );
document.write( "R=20/.5<BR>\n" );
document.write( "R=40 MPH. AGAINST THE WIND.<BR>\n" );
document.write( "(50-40)/2=10/2=5 MPH IS THE SPEED OF THE WIND.<BR>\n" );
document.write( "PROOF:<BR>\n" );
document.write( "50-5=45 MPH SPEED OF THE ULTRA LIGHT.<BR>\n" );
document.write( "40+5=45 MPH DITTO.<BR>\n" );
document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );