document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=51627>Question 51627</A>: <I><SPAN STYLE=\"word-break: break-all;\"> at 10:30 A.M. two planes leave Houston, one flying east at 560 km/h and the other flying west at 640 km/h. At what time will they be 2100 km apart? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #34424 by </B><A HREF=/tutors/aboutme.mpl?userid=rchill><B>rchill(405)</B></A><img src=\"/images/stars/stars-10.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=rchill><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=34424\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Because the planes are flying in opposite directions, the equation becomes <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=560x%2B640x=2100 ALIGN=MIDDLE  ALT=\"560x%2B640x=2100\"   DISABLED_style= \"max-width:90%; height:auto;\" > where x is the value in hours.  Combining like terms produces <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=1200x=2100 ALIGN=MIDDLE  ALT=\"1200x=2100\"   DISABLED_style= \"max-width:90%; height:auto;\" >.  Now divide both sides by 1200:  <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=1200x%2F1200=2100%2F1200 ALIGN=MIDDLE  ALT=\"1200x%2F1200=2100%2F1200\"   DISABLED_style= \"max-width:90%; height:auto;\" > which reduces to <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=x=2100%2F1200 ALIGN=MIDDLE  ALT=\"x=2100%2F1200\"   DISABLED_style= \"max-width:90%; height:auto;\" >.  This simplifies to <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=x=7%2F4 ALIGN=MIDDLE  ALT=\"x=7%2F4\"   DISABLED_style= \"max-width:90%; height:auto;\" > or 1.75 hours, which is the same as 1 hour 45 minutes. </SPAN>\n" );
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