document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=997917>Question 997917</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Bill Drives to work. Because of traffic conditions, he averages 30 miles per hour. He returns home averaging 40 miles per hour. The total time is four and a half hours. Write and solve an equation to find the time Bill spends driving to work.<BR>\n" );
document.write( " </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #615875 by </B><A HREF=/tutors/aboutme.mpl?userid=josgarithmetic><B>josgarithmetic(39617)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=josgarithmetic><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=615875\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> <PRE STYLE=\"white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;\">\r\n" );
document.write( "                     rate       time         distance\r\n" );
document.write( "\r\n" );
document.write( "WORK, TRAFFIC        <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=r%5Bw%5D ALIGN=MIDDLE  ALT=\"r%5Bw%5D\"   DISABLED_style= \"max-width:90%; height:auto;\" >       <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=d%2Fr%5Bw%5D ALIGN=MIDDLE  ALT=\"d%2Fr%5Bw%5D\"   DISABLED_style= \"max-width:90%; height:auto;\" >           d\r\n" );
document.write( "\r\n" );
document.write( "HOME, FASTER         <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=r%5Bh%5D ALIGN=MIDDLE  ALT=\"r%5Bh%5D\"   DISABLED_style= \"max-width:90%; height:auto;\" >       <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=d%2Fr%5Bh%5D ALIGN=MIDDLE  ALT=\"d%2Fr%5Bh%5D\"   DISABLED_style= \"max-width:90%; height:auto;\" >           d\r\n" );
document.write( "\r\n" );
document.write( "Total                            t\r\n" );
document.write( "</PRE>\r<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( "The description means that these variable values are assigned:<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=system%28r%5Bw%5D=30%2Cr%5Bh%5D=40%2Ct=4%261%2F2%29 ALIGN=MIDDLE  ALT=\"system%28r%5Bw%5D=30%2Cr%5Bh%5D=40%2Ct=4%261%2F2%29\"   DISABLED_style= \"max-width:90%; height:auto;\" >.  \r<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( "The unknown variable in the whole description is d, the distance each way between work and home.  The time sum equation will be what to use to solve for d.\r<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=highlight%28d%2Fr%5Bw%5D%2Bd%2Fr%5Bh%5D=t%29 ALIGN=MIDDLE  ALT=\"highlight%28d%2Fr%5Bw%5D%2Bd%2Fr%5Bh%5D=t%29\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=d%281%2Fr%5Bw%5D%2B1%2Fr%5Bh%5D%29=t ALIGN=MIDDLE  ALT=\"d%281%2Fr%5Bw%5D%2B1%2Fr%5Bh%5D%29=t\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
document.write( "\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=d=t%2F%281%2Fr%5Bw%5D%2B1%2Fr%5Bh%5D%29 ALIGN=MIDDLE  ALT=\"d=t%2F%281%2Fr%5Bw%5D%2B1%2Fr%5Bh%5D%29\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
document.write( "\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=d=t%2F%28%28r%5Bh%5D%2Br%5Bw%5D%29%2F%28r%5Bw%5Dr%5Bh%5D%29%29 ALIGN=MIDDLE  ALT=\"d=t%2F%28%28r%5Bh%5D%2Br%5Bw%5D%29%2F%28r%5Bw%5Dr%5Bh%5D%29%29\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
document.write( "\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=highlight%28d=%28r%5Bw%5Dr%5Bh%5Dt%29%2F%28r%5Bw%5D%2Br%5Bh%5D%29%29 ALIGN=MIDDLE  ALT=\"highlight%28d=%28r%5Bw%5Dr%5Bh%5Dt%29%2F%28r%5Bw%5D%2Br%5Bh%5D%29%29\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( "You solve for d, distance each way, but not yet solved for time each way.  Just use the expressions shown in the data table, substitute for d and for the given rates, and evaluate each time value. </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );