document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=253210>Question 253210</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Another word problem!\r<BR>\n" );
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document.write( "A six passenger plan 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?  </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #185452 by </B><A HREF=/tutors/aboutme.mpl?userid=drk><B>drk(1908)</B></A><img src=\"/images/stars/stars-12.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=drk><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=185452\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> This is a rate x time = distance problem. Here is the table based on the question:<BR>\n" );
document.write( "wind . . . . . rate . . . . . . . . . time . . . . . . . . . . .distance<BR>\n" );
document.write( "with . . . . .  r + 180 . . . . . . .  t . . . . . . . . . . . . . .  7<BR>\n" );
document.write( "against . . . r - 180 . . . . . . . . t . . . . . . . . . . . . . . 5<BR>\n" );
document.write( "The time is distance / rate or<BR>\n" );
document.write( "7/(r+180) and 5/(r-180).<BR>\n" );
document.write( "Since the times were the same set these fractions equal to each other as:<BR>\n" );
document.write( "7/(r+180)  = 5/(r-180).<BR>\n" );
document.write( "Cross multiply to get<BR>\n" );
document.write( "7r - 1260 = 5r + 900<BR>\n" );
document.write( "solve for r to get<BR>\n" );
document.write( "2r = 2160<BR>\n" );
document.write( "r = 1080.<BR>\n" );
document.write( "The wind speed is 1080 mph.<BR>\n" );
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