document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=745393>Question 745393</A>: <I><SPAN STYLE=\"word-break: break-all;\"> jan hiked up a hill at 4 mi/hr and back down at 6 mi/hr.  Her total hiking time was 3 hours.  how long did the trip up the hill take her? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #453858 by </B><A HREF=/tutors/aboutme.mpl?userid=Alan3354><B>Alan3354(69443)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=Alan3354><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=Alan3354><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=453858\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> jan hiked up a hill at 4 mi/hr and back down at 6 mi/hr.  Her total hiking time was 3 hours.  how long did the trip up the hill take her?<BR>\n" );
document.write( "------------<BR>\n" );
document.write( "Avg speed of a round trip is similar to parallel resistances and parallel flows.<BR>\n" );
document.write( "Avg = 2*r1*r2/(r1 + r2)<BR>\n" );
document.write( "The distance is irrelevant.<BR>\n" );
document.write( "----<BR>\n" );
document.write( "Avg = 2*4*6/(4+6) = 48/10<BR>\n" );
document.write( "Avg = 4.8 mi/hr<BR>\n" );
document.write( "RT distance = 4.8*3 = 14.4 miles --> 7.2 miles each way<BR>\n" );
document.write( "time going uphill = 7.2/4 = 1.8 hours<BR>\n" );
document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );