document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=777495>Question 777495</A>: <I><SPAN STYLE=\"word-break: break-all;\"> kali left school and traveled toward her friend's house at an average speed of 40 km/h. matt left one hour later and traveled in the opposite direction with an average speed of 50 km/h. how many hours does matt needs to travel before they are 400 km apart?<BR>\n" );
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document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #474132 by </B><A HREF=/tutors/aboutme.mpl?userid=hope723><B>hope723(1)</B></A><img src=\"/images/stars/iconNewId_16x16.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=hope723><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=474132\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Kali r: 40  t:x+1<BR>\n" );
document.write( "Matt r: 50  t:x\r<BR>\n" );
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document.write( "Okay. First what you're going to do is write your equation, d=rt<BR>\n" );
document.write( "Because distance is 400, plug that in. Also, because you have two people, the equation is d=rt+rt, if that makes any sense at all. So here's your equation.\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=400=40%28x%2B1%29%2B50x ALIGN=MIDDLE  ALT=\"400=40%28x%2B1%29%2B50x\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "Now use the distributive property.<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=400=40x%2B40%2B50x ALIGN=MIDDLE  ALT=\"400=40x%2B40%2B50x\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "Now, subtract 40 from both sides of the equal sign.<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=360=40x%2B50x ALIGN=MIDDLE  ALT=\"360=40x%2B50x\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "Combine like terms.<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=360=90x ALIGN=MIDDLE  ALT=\"360=90x\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "Now, divide both sides by 90.<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=4=x ALIGN=MIDDLE  ALT=\"4=x\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "Therefore, Matt needs to drive four hours before him and Kali are 400 km apart. </SPAN>\n" );
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