document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=487869>Question 487869</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Jack travels from A to B at 30 mph, and returns at 10 mph. Jill leaves at the same time as Jack, and travels from A to B and back at a constant speed of 20 mph. Who gets back first? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #333176 by </B><A HREF=/tutors/aboutme.mpl?userid=ankor@dixie-net.com><B>ankor@dixie-net.com(22740)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=ankor@dixie-net.com><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=ankor@dixie-net.com><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=333176\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Jack travels from A to B at 30 mph, and returns at 10 mph.<BR>\n" );
document.write( "Jill leaves at the same time as Jack, and travels from A to B and back at a constant speed of 20 mph.<BR>\n" );
document.write( " Who gets back first?<BR>\n" );
document.write( ":<BR>\n" );
document.write( "let d = the one way distance<BR>\n" );
document.write( "let a = Jack's average speed for the round trip<BR>\n" );
document.write( ":<BR>\n" );
document.write( "write a time equation<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=d%2F30 ALIGN=MIDDLE  ALT=\"d%2F30\"   DISABLED_style= \"max-width:90%; height:auto;\" > + <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=d%2F10 ALIGN=MIDDLE  ALT=\"d%2F10\"   DISABLED_style= \"max-width:90%; height:auto;\" > = <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=%282d%29%2Fa ALIGN=MIDDLE  ALT=\"%282d%29%2Fa\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "Multiply by 30a<BR>\n" );
document.write( "da + 3da = 30(2d)<BR>\n" );
document.write( "da + 3da = 60d<BR>\n" );
document.write( "Simplify divide by d<BR>\n" );
document.write( "a + 3a = 60<BR>\n" );
document.write( "4a = 60<BR>\n" );
document.write( "a = <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=60%2F4 ALIGN=MIDDLE  ALT=\"60%2F4\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "a = 15 mph av speed, obviously, Jill will get back first<BR>\n" );
document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );