document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=10606>Question 10606</A>: <I><SPAN STYLE=\"word-break: break-all;\"> PLANE FLIES POINT A TO POINT B, 120 MILES IN 12 HOURS, FLYING INTO A HEADWIND.  ON THE RETURN TRIP WITH THE SAME WIND AS A TAIL WIND, THE TRIP FROM POINT B TO POINT A TAKES ONLY 2 HOURS.  HOW FAST IS THE PLANE FLYING THROUGH THE AIR?  HOW FAST IS THE WIND BLOWING? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #5626 by </B><A HREF=/tutors/aboutme.mpl?userid=mathmaven53><B>mathmaven53(29)</B></A><img src=\"/images/stars/stars-07.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=mathmaven53><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=5626\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Let v be speed of plane through air and w the speed of the wind\r<BR>\n" );
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document.write( " From A to B the plane is traveling at speed v-w with the headwind\r<BR>\n" );
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document.write( " It takes 12 hours to go 120 miles \r<BR>\n" );
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document.write( " 12(v-w) =120\r<BR>\n" );
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document.write( "  v-w = 10\r<BR>\n" );
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document.write( " From B to A the plane is traveling  at speed v+w with the tail wind\r<BR>\n" );
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document.write( " It takes 2 hours  to go 120 miles\r<BR>\n" );
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document.write( " 2(v+w) = 120\r<BR>\n" );
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document.write( " v + w = 60\r<BR>\n" );
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document.write( " Solve the system   v-w = 10, v + w = 60 </SPAN>\n" );
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