document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=890089>Question 890089</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Two planes leave los Angeles at the same time. One head south to San Diego, while the other heads north to San Francisco. The San Diego plane flies 50mph slower than the San Francisco plane. In half hour the planes are 275 miles apart. What are their speeds? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #538684 by </B><A HREF=/tutors/aboutme.mpl?userid=josmiceli><B>josmiceli(19441)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=josmiceli><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=josmiceli><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=538684\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Think of this as one of the planes flying away <BR>\n" );
document.write( "from the other at the sum of their speeds<BR>\n" );
document.write( "and the other plane not moving<BR>\n" );
document.write( "( parked on runway )<BR>\n" );
document.write( "--------------------------<BR>\n" );
document.write( "Let <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+s+ ALIGN=MIDDLE  ALT=\"+s+\"   DISABLED_style= \"max-width:90%; height:auto;\" > = the speed of the faster plane in mi/hr<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+s+-+50+ ALIGN=MIDDLE  ALT=\"+s+-+50+\"   DISABLED_style= \"max-width:90%; height:auto;\" > = the speed of the slower plane<BR>\n" );
document.write( "-----------------------------------------<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+275+=+%28+s+%2B+s+-+50+%29%2A%28+1%2F2+%29+ ALIGN=MIDDLE  ALT=\"+275+=+%28+s+%2B+s+-+50+%29%2A%28+1%2F2+%29+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+550+=+2s+-+50+ ALIGN=MIDDLE  ALT=\"+550+=+2s+-+50+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+2s+=+600+ ALIGN=MIDDLE  ALT=\"+2s+=+600+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+s+=+300+ ALIGN=MIDDLE  ALT=\"+s+=+300+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+s+-+50+=+250+ ALIGN=MIDDLE  ALT=\"+s+-+50+=+250+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "The LA to SD plane's speed is 300 mi/hr<BR>\n" );
document.write( "The LA to SF plane's speed is 250 mi/hr<BR>\n" );
document.write( "-----------------------------------<BR>\n" );
document.write( "check:<BR>\n" );
document.write( "The LA to SD plane:<BR>\n" );
document.write( "(1) <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+d%5B1%5D+=+300%2A%281%2F2%29+ ALIGN=MIDDLE  ALT=\"+d%5B1%5D+=+300%2A%281%2F2%29+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "The LA to SF plane:<BR>\n" );
document.write( "(2) <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+d%5B2%5D+=+250%2A%281%2F2%29+ ALIGN=MIDDLE  ALT=\"+d%5B2%5D+=+250%2A%281%2F2%29+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "------------------------<BR>\n" );
document.write( "(1) <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+d%5B1%5D+=+150+ ALIGN=MIDDLE  ALT=\"+d%5B1%5D+=+150+\"   DISABLED_style= \"max-width:90%; height:auto;\" > mi<BR>\n" );
document.write( "(2) <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+d%5B2%5D+=+125+ ALIGN=MIDDLE  ALT=\"+d%5B2%5D+=+125+\"   DISABLED_style= \"max-width:90%; height:auto;\" > mi<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+d%5B1%5D+%2B+d%5B2%5D+=+150+%2B+125+ ALIGN=MIDDLE  ALT=\"+d%5B1%5D+%2B+d%5B2%5D+=+150+%2B+125+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+d%5B1%5D+%2B+d%5B2%5D+=+275+ ALIGN=MIDDLE  ALT=\"+d%5B1%5D+%2B+d%5B2%5D+=+275+\"   DISABLED_style= \"max-width:90%; height:auto;\" > mi<BR>\n" );
document.write( "OK\r<BR>\n" );
document.write( "\n" );
document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );