document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=985702>Question 985702</A>: <I><SPAN STYLE=\"word-break: break-all;\"> 1. You and your brother both leave your house at the same instant and drive in separate cars along a straight highway to a nearby lake. After 10 min, you are both 3.0 km from your house. You are now driving at 70 km/h , and you continue at this constant speed; your brother is going faster than this. After another 18 min , your brother arrives at the lake, but you are still 7.0 km away.\r<BR>\n" );
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document.write( "a) how far is it from your house to the lake? <BR>\n" );
document.write( "b) what is your brother's average speed?<BR>\n" );
document.write( "c) your brother beats you to the lake by what time? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #606540 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=606540\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> After 10 min, you are both 3.0 km from your house.<BR>\n" );
document.write( " You are now driving at 70 km/h , and you continue at this constant speed; your brother is going faster than this.<BR>\n" );
document.write( " After another 18 min , your brother arrives at the lake, but you are still 7.0 km away.<BR>\n" );
document.write( ":<BR>\n" );
document.write( "a) how far is it from your house to the lake?<BR>\n" );
document.write( "convert 18 min to hrs: 18/60 = .3 hrs<BR>\n" );
document.write( "d = 3 + .3(70) + 7<BR>\n" );
document.write( "d = 3 + 21 + 7<BR>\n" );
document.write( "d = 31 km to the lake<BR>\n" );
document.write( ":<BR>\n" );
document.write( "b) what is your brother's average speed?<BR>\n" );
document.write( "It took him 18 min to travel 31-3 = 28 km<BR>\n" );
document.write( "18 min to hrs:  18/60 = .3 hrs<BR>\n" );
document.write( "s = <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=28%2F.3 ALIGN=MIDDLE  ALT=\"28%2F.3\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "s = 93<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;\" > km/hr from the 3 km point<BR>\n" );
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document.write( "c) your brother beats you to the lake by what time?<BR>\n" );
document.write( "Your time for the last 28 km<BR>\n" );
document.write( "t = <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=28%2F70 ALIGN=MIDDLE  ALT=\"28%2F70\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "t = .4 hrs which is .4(60) = 24 min<BR>\n" );
document.write( "24 - 18 = 6 min, beat you by this time </SPAN>\n" );
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