document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=907726>Question 907726</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Richard Stewart commutes to work by first driving on country roads at an average speed of 45 miles per hour. He then drives on the interstate highway at an average speed of 75 miles or hour. Richards total commuting distance is 42 miles and his total commuting time is 0.6 hours. Determine the time Richard spends driving on country and the time he spends driving on the interstate highway. </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #550527 by </B><A HREF=/tutors/aboutme.mpl?userid=lwsshak3><B>lwsshak3(11628)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=lwsshak3><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=550527\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Richard Stewart commutes to work by first driving on country roads at an average speed of 45 miles per hour. He then drives on the interstate highway at an average speed of 75 miles or hour. Richards total commuting distance is 42 miles and his total commuting time is 0.6 hours. Determine the time Richard spends driving on country and the time he spends driving on the interstate highway.<BR>\n" );
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document.write( "let x=distance Richard spends driving on country roads<BR>\n" );
document.write( "42-x=distance Richard spends driving on the interstate highway<BR>\n" );
document.write( "travel time=distance/speed<BR>\n" );
document.write( "..<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=x%2F45%2B%2842-x%29%2F75=0.6 ALIGN=MIDDLE  ALT=\"x%2F45%2B%2842-x%29%2F75=0.6\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "75x+45(42-x)=.6*45*75<BR>\n" );
document.write( "75x+1890-45x=2025<BR>\n" );
document.write( "30x=135<BR>\n" );
document.write( "x=4.5 miles<BR>\n" );
document.write( "42-x=37.5 miles<BR>\n" );
document.write( "4.5/45=0.10<BR>\n" );
document.write( "45/37.5=0.50<BR>\n" );
document.write( "time Richard spends driving on country roads=0.10 hr<BR>\n" );
document.write( "time Richard spends driving on the interstate highway=0.50 hr </SPAN>\n" );
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