document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=141479>Question 141479</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A plane flies 300 miles with a tail wind in 1 hour. It takes the same plane 2 hours to fly<BR>\n" );
document.write( "the 300 miles when flying against the wind. What is the plane’s speed in still air? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #103078 by </B><A HREF=/tutors/aboutme.mpl?userid=stanbon><B>stanbon(75887)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=stanbon><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=103078\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> A plane flies 300 miles with a tail wind in 1 hour. It takes the same plane 2 hours to fly the 300 miles when flying against the wind. What is the plane’s speed in still air?<BR>\n" );
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document.write( "Let plane speed in still air be \"p\".<BR>\n" );
document.write( "Let wind speed be \"w\".<BR>\n" );
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document.write( "With wind DATA:<BR>\n" );
document.write( "distance = 300 ; time = 1 hr ; rate = 300/1 mph<BR>\n" );
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document.write( "against wind DATA:<BR>\n" );
document.write( "distance = 300 ;time = 2 hr ; rate = 300/2 = 150 mph<BR>\n" );
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document.write( "EQUATIONS:<BR>\n" );
document.write( "p+w = 300<BR>\n" );
document.write( "p-w = 150<BR>\n" );
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document.write( "Add to get:<BR>\n" );
document.write( "2p = 450<BR>\n" );
document.write( "p = 225 mph (speed of plane in still air)<BR>\n" );
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document.write( "Substitute into p+w = 300 to solve for w:<BR>\n" );
document.write( "225 + w = 300<BR>\n" );
document.write( "w = 75 mph (speed of the wind)<BR>\n" );
document.write( "===================================<BR>\n" );
document.write( "Cheers,<BR>\n" );
document.write( "Stan H.<BR>\n" );
document.write( " </SPAN>\n" );
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