document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=170787>Question 170787</A>This question is from textbook <A HREF=http://www.amazon.com/exec/obidos/ASIN/0395977258/algebrahomeworkh>Algebra and Trigonometry Structure and Method Book 2</A><BR>\n" );
document.write( ": <I><SPAN STYLE=\"word-break: break-all;\"> I've tried to set this up, yet I have no idea on how to solve it.<BR>\n" );
document.write( "\"Helped by a strong jetstream, a Los Angeles-to-Boston plane flew 10% faster than usual and made the 4400km trip in 30min less time than usual. At what speed does the plane usually fly?\" </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #126088 by </B><A HREF=/tutors/aboutme.mpl?userid=Mathtut><B>Mathtut(3670)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=Mathtut><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=126088\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> well..lets call the normal rate and time r and t respectively. so if rate is 10% faster then the rate would be 1.1r in this case and t would be t-(1/2)<BR>\n" );
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document.write( "4400=rt--->r=4400/t<BR>\n" );
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document.write( "4400=1.1r(t-1/2)<BR>\n" );
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document.write( "take r's value from first equation and plug it into second equation<BR>\n" );
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document.write( "4400=1.1(4400/t)((2t-1)/2)  cross multiply<BR>\n" );
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document.write( "8800t=1.1(4400)(2t-1)<BR>\n" );
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document.write( "8800t=4840(2t-1)---> 8800t=9680t-4840<BR>\n" );
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document.write( "880t=4840<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=t=5.5 ALIGN=MIDDLE  ALT=\"t=5.5\"   DISABLED_style= \"max-width:90%; height:auto;\" >hours so plugging this into the 1st equation<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=highlight%284400%2F5.5=800%29 ALIGN=MIDDLE  ALT=\"highlight%284400%2F5.5=800%29\"   DISABLED_style= \"max-width:90%; height:auto;\" >mph plane usually flies at </SPAN>\n" );
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