document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=130565>Question 130565</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A patrol plane flies 220 miles per hour in still air. It carries fuel for 4 hours of safe flying. If it takes off on patrol against a wind of 20 miles per hour, how far can it fly and return safely? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #95366 by </B><A HREF=/tutors/aboutme.mpl?userid=ptaylor><B>ptaylor(2198)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=ptaylor><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=ptaylor><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=95366\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> <BR>\n" );
document.write( "Distance(d)=Rate(r) times Time(t) or d=rt; r=d/t and t=d/r\r<BR>\n" );
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document.write( "rate of the plane against the wind=220-20=200 mph<BR>\n" );
document.write( "rate of the plane with the wind=220+20=240 mph<BR>\n" );
document.write( "distance flown with the wind = distance flown against the wind<BR>\n" );
document.write( "Time flying against the wind=d/200<BR>\n" );
document.write( "Time flying with the wind=d/240\r<BR>\n" );
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document.write( "And we are told that these two times add up to 4 hours, so:\r<BR>\n" );
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document.write( "(d/200)+(d/240)=4  multiply each term by 4<BR>\n" );
document.write( "d/50 + d/60=16<BR>\n" );
document.write( "6d/300 + 5d/300=16<BR>\n" );
document.write( "6d+5d=4800<BR>\n" );
document.write( "11d=4800<BR>\n" );
document.write( "d=436.36 mi---distance the plane can fly out and return safely (actually if I was the pilot I would shoot for about 420 mi out)\r<BR>\n" );
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document.write( "CK<BR>\n" );
document.write( "436.36/200+436.36/240=4<BR>\n" );
document.write( "3.99999999999999999999---~~4\r<BR>\n" );
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document.write( "Hope this helps---ptaylor </SPAN>\n" );
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