document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=537331>Question 537331</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Freddie gets a car ride to the top of a hill, then rides his skateboard back down. The downhill ride takes 15 minutes longer than the uphill.  If the car averages 32 mph, and Freddie rides his skateboard at 8 mph, find out how much time he spends skateboarding.\r<BR>\n" );
document.write( "\n" );
document.write( "Let t=time spent driving to the top of the hill then, t+15=time going down the hill.<BR>\n" );
document.write( "distance up=distance down<BR>\n" );
document.write( "from the formula speed=distance/time(s=d/t), then d=st, \r<BR>\n" );
document.write( "\n" );
document.write( "32t=8(t+15)<BR>\n" );
document.write( "32t=8t+120\r<BR>\n" );
document.write( "\n" );
document.write( "I can't get to the answer of 1/3 hour.  I keep coming up with 1/4 hour. </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #352826 by </B><A HREF=/tutors/aboutme.mpl?userid=stanbon><B>stanbon(75887)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=stanbon><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=352826\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Freddie gets a car ride to the top of a hill, then rides his skateboard back down. <BR>\n" );
document.write( "The downhill ride takes 15 minutes longer than the uphill. <BR>\n" );
document.write( "If the car averages 32 mph, and Freddie rides his skateboard at 8 mph, find out how much time he spends skateboarding.<BR>\n" );
document.write( "---<BR>\n" );
document.write( "Drive up DATA:<BR>\n" );
document.write( "rate = 32 mph ; time = t hrs ; distance = 32t miles<BR>\n" );
document.write( "-----<BR>\n" );
document.write( "Skate down DATA:<BR>\n" );
document.write( "rate = 8 mph ; time = t+(1/4) hrs ; distance = 8(t+(1/4)) miles<BR>\n" );
document.write( "----- <BR>\n" );
document.write( "Equation:<BR>\n" );
document.write( "distance up = distance down:<BR>\n" );
document.write( "32t = 8t+2<BR>\n" );
document.write( "24t = 2<BR>\n" );
document.write( "time = 1/12 hr = 5 minutes (time up)<BR>\n" );
document.write( "time down = 5 min + 15 min = 20 min (time down)<BR>\n" );
document.write( "---<BR>\n" );
document.write( "Total skate time = 20 min = 1/3 hr.<BR>\n" );
document.write( "====================================<BR>\n" );
document.write( "Cheers,<BR>\n" );
document.write( "Stan H.<BR>\n" );
document.write( "===================  </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );