document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=175691>Question 175691</A>: <I><SPAN STYLE=\"word-break: break-all;\"> a 6 passenger plane cruises at 180 mph in calm air. if the plane flies 7 miles with the wind in the same amount of time as it flies 5 miles against the wind, then what is the wind speed?\r<BR>\n" );
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document.write( "i know that r= d/t </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #130790 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=130790\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> a 6 passenger plane cruises at 180 mph in calm air. if the plane flies 7 miles with the wind in the same amount of time as it flies 5 miles against the wind, then what is the wind speed? <BR>\n" );
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document.write( "Withwind DATA:<BR>\n" );
document.write( "rate = 180+c ; distance = 7 mi ; time = d/r = 7/(180+c) hrs.<BR>\n" );
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document.write( "againstwind DATA:<BR>\n" );
document.write( "rate = 180-c ; distance = 5 mi ; time = d/r = 5/(180-c) hrs.<BR>\n" );
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document.write( "EQUATION:<BR>\n" );
document.write( "time = time = 7/(180+c) = 5/(180-c)<BR>\n" );
document.write( "Cross-multiply<BR>\n" );
document.write( "7(180-c) = 5(180+c)<BR>\n" );
document.write( "7*180 - 7c = 5*180+5c<BR>\n" );
document.write( "12c = 2*180<BR>\n" );
document.write( "c = 2*15<BR>\n" );
document.write( "c = 30 mph (speed of the wind)<BR>\n" );
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document.write( "Cheers,<BR>\n" );
document.write( "Stan H. </SPAN>\n" );
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