document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=788754>Question 788754</A>: <I><SPAN STYLE=\"word-break: break-all;\"> On a drive from your home to town, you wish<BR>\n" );
document.write( "to average 33.6 mph. The distance from your<BR>\n" );
document.write( "home to town is 90 miles. However, at 45 miles<BR>\n" );
document.write( "(half way), you &#64257;nd you have averaged only<BR>\n" );
document.write( "25.2 mph.<BR>\n" );
document.write( "What average speed must you maintain in<BR>\n" );
document.write( "the remaining distance in order to have an<BR>\n" );
document.write( "overall average speed of 33.6 mph?<BR>\n" );
document.write( "Answer in units of mph </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #478608 by </B><A HREF=/tutors/aboutme.mpl?userid=mananth><B>mananth(16946)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=mananth><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/cgi-bin/show-face.mpl?user=mananth><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=478608\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> On a drive from your home to town, you wish<BR>\n" );
document.write( "to average 33.6 mph. The distance from your<BR>\n" );
document.write( "home to town is 90 miles. However, at 45 miles<BR>\n" );
document.write( "(half way), you &#64257;nd you have averaged only<BR>\n" );
document.write( "25.2 mph.<BR>\n" );
document.write( "What average speed must you maintain in<BR>\n" );
document.write( "the remaining distance in order to have an<BR>\n" );
document.write( "overall average speed of 33.6 mph?<BR>\n" );
document.write( "Answer in units of mph\r<BR>\n" );
document.write( "\n" );
document.write( "let the speed be x\r<BR>\n" );
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document.write( "total average = 33.6<BR>\n" );
document.write( "distance = 90\r<BR>\n" );
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document.write( "time = 90/33.6\r<BR>\n" );
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document.write( "Time first leg = 45/25.2\r<BR>\n" );
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document.write( "Time second leg= 45/x\r<BR>\n" );
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document.write( "45/25.2 + 45/x = 90/33.6\r<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( " 45/x = 90/33.6 - 45/25.2 \r<BR>\n" );
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document.write( "45/x = 0.893\r<BR>\n" );
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document.write( "x= 45/0.893\r<BR>\n" );
document.write( "\n" );
document.write( "x=50.49 mph\r<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );