document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=156250>Question 156250</A>This question is from textbook <A HREF=http://www.amazon.com/exec/obidos/ASIN/0395977258/algebrahomeworkh>Algebra and Trigonometry Structure and Method book 2</A><BR>\n" );
document.write( ": <I><SPAN STYLE=\"word-break: break-all;\"> I have been working on this problem and I have tried it many times and I still can't figure it out. I was wondering if someone could help me? I would deeply appreciate it! Please and Thank You!!!\r<BR>\n" );
document.write( "\n" );
document.write( "A subway train makes six stops of equal length during its 21 km run. The train is actually moving for 20 min of the trip. At most how long can the train remain at each station if the average speed for the trip, including stops, is to be at least 36 km/h? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #115501 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=115501\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> A subway train makes six stops of equal length during its 21 km run. The train is actually moving for 20 min of the trip. At most how long can the train remain at each station if the average speed for the trip, including stops, is to be at least 36 km/h<BR>\n" );
document.write( ":<BR>\n" );
document.write( "Convert 20 min to <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=1%2F3 ALIGN=MIDDLE  ALT=\"1%2F3\"   DISABLED_style= \"max-width:90%; height:auto;\" > hr<BR>\n" );
document.write( ":<BR>\n" );
document.write( "Let s = duration of the stop in hrs<BR>\n" );
document.write( ":<BR>\n" );
document.write( "Write a speed equation: speed = <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=dist%2Ftime ALIGN=MIDDLE  ALT=\"dist%2Ftime\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( ":<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=21%2F%28%286s%2B%281%2F3%29%29%29 ALIGN=MIDDLE  ALT=\"21%2F%28%286s%2B%281%2F3%29%29%29\"   DISABLED_style= \"max-width:90%; height:auto;\" > => 36<BR>\n" );
document.write( ":<BR>\n" );
document.write( "21 => 36(6s+<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=1%2F3 ALIGN=MIDDLE  ALT=\"1%2F3\"   DISABLED_style= \"max-width:90%; height:auto;\" >)<BR>\n" );
document.write( "21 => 216s + 12<BR>\n" );
document.write( ";<BR>\n" );
document.write( "21 - 12 => 216s<BR>\n" );
document.write( ":<BR>\n" );
document.write( "216s <= 9<BR>\n" );
document.write( "Convert hrs to minutes<BR>\n" );
document.write( "s <= <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=9%2F216 ALIGN=MIDDLE  ALT=\"9%2F216\"   DISABLED_style= \"max-width:90%; height:auto;\" > * 60<BR>\n" );
document.write( "s <= 2.5 min per stop to average 36 km.hr or greater<BR>\n" );
document.write( ":<BR>\n" );
document.write( "Check solution<BR>\n" );
document.write( "Total time 6(2.5) + 20 = 35 min<BR>\n" );
document.write( ":<BR>\n" );
document.write( "Find the distance<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=35%2F60 ALIGN=MIDDLE  ALT=\"35%2F60\"   DISABLED_style= \"max-width:90%; height:auto;\" > * 36 = 21 km confirms our solution </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );