document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=272981>Question 272981</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A plane flies at 170 mph for the first and last half hour of a flight. It flies at a higher constant speed for the rest of the flight. The route is 2020 miles. The plane is 920 miles from the destination 2 hours before the end of the flight.\r<BR>\n" );
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document.write( "How many hours is the entire flight?\r<BR>\n" );
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document.write( "I have gotten that it is between 4-5 hours but I cannot seem to workout the exact amount. Any help would be great and much appreciated!! </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #199507 by </B><A HREF=/tutors/aboutme.mpl?userid=dabanfield><B>dabanfield(803)</B></A><img src=\"/images/stars/stars-11.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=dabanfield><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=199507\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> A plane flies at 170 mph for the first and last half hour of a flight. It flies at a higher constant speed for the rest of the flight. The route is 2020 miles. The plane is 920 miles from the destination 2 hours before the end of the flight. <BR>\n" );
document.write( "How many hours is the entire flight? <BR>\n" );
document.write( "I have gotten that it is between 4-5 hours but I cannot seem to workout the exact amount. Any help would be great and much appreciated!!\r<BR>\n" );
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document.write( "The last 920 miles are covered in 2 hours.  The last half hour is flown at 170 mph so the distance covered in the last half hour is 170*.5 = 85 miles. So in the 1.5 hours prior to the last half hour the plane covers 920-85 = 835 miles. The speed of the plane then is 835/1.5 = 556.66 mph. This means then that for the entire distance except that covered by the first and last half hours is<BR>\n" );
document.write( "2020 - 85 - 85 = <BR>\n" );
document.write( "2020 - 170 = 1850\r<BR>\n" );
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document.write( "The time taken for this part of the flight is 1850/556.66 = 3.32 hours.\r<BR>\n" );
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document.write( "So the entire flight takes .5 + 3.32 + .5 = 4.32 hours  </SPAN>\n" );
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