document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=136251>Question 136251</A>This question is from textbook <A HREF=http://www.amazon.com/exec/obidos/ASIN/0321227573/algebrahomeworkh>College Algebra</A><BR>\n" );
document.write( ": <I><SPAN STYLE=\"word-break: break-all;\"> Two planes leave Los Angeles at the same time. One heads south to San Diego; the other heads north to San Francisco. The San Francisco plane flies 50 mph faster. In 1/2 hr, the planes are 275 mi 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 #99800 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=99800\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> In all these type problems, the key usually lies in answering<BR>\n" );
document.write( "the question \"What is the same for both (planes, cars, whatever)?<BR>\n" );
document.write( "In this case it is time. They both fly for 1/2 hr.<BR>\n" );
document.write( "Let <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=d ALIGN=MIDDLE  ALT=\"d\"   DISABLED_style= \"max-width:90%; height:auto;\" > = the distance covered by the San Francisco plane in 1/2 hr<BR>\n" );
document.write( "Then <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=275+-+d ALIGN=MIDDLE  ALT=\"275+-+d\"   DISABLED_style= \"max-width:90%; height:auto;\" > will be the distance covered by the San Diago plane<BR>\n" );
document.write( "<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 S.F. plane<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 S.D. plane<BR>\n" );
document.write( "For S.F. plane:<BR>\n" );
document.write( "(1) <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=d+=+s%2A%28.5%29 ALIGN=MIDDLE  ALT=\"d+=+s%2A%28.5%29\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "For S.D. plane:<BR>\n" );
document.write( "(2)<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=275+-+d+=+%28s-50%29%2A%28.5%29 ALIGN=MIDDLE  ALT=\"275+-+d+=+%28s-50%29%2A%28.5%29\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "Substitute <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=d ALIGN=MIDDLE  ALT=\"d\"   DISABLED_style= \"max-width:90%; height:auto;\" > in (1) for <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=d ALIGN=MIDDLE  ALT=\"d\"   DISABLED_style= \"max-width:90%; height:auto;\" > in (2)<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=275+-+.5s+=+.5%2A%28s+-+50%29 ALIGN=MIDDLE  ALT=\"275+-+.5s+=+.5%2A%28s+-+50%29\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=275+-+.5s+=+.5s+-+25 ALIGN=MIDDLE  ALT=\"275+-+.5s+=+.5s+-+25\"   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;\" > mi/hr<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;\" >mi/hr<BR>\n" );
document.write( "The speed of the San Francisco plane is 300 mi/hr<BR>\n" );
document.write( "The speed of the San Diago plane is 250 mi/hr<BR>\n" );
document.write( "Check answer:<BR>\n" );
document.write( "For S.F. plane:<BR>\n" );
document.write( "(1) <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=d+=+s%2A%28.5%29 ALIGN=MIDDLE  ALT=\"d+=+s%2A%28.5%29\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "For S.D. plane:<BR>\n" );
document.write( "(2)<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=275+-+d+=+%28s-50%29%2A%28.5%29 ALIGN=MIDDLE  ALT=\"275+-+d+=+%28s-50%29%2A%28.5%29\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=d+=+.5%2A300 ALIGN=MIDDLE  ALT=\"d+=+.5%2A300\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=d+=+150 ALIGN=MIDDLE  ALT=\"d+=+150\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=275+-+150+=+.5%2A%28300+-+50%29 ALIGN=MIDDLE  ALT=\"275+-+150+=+.5%2A%28300+-+50%29\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=125+=+125 ALIGN=MIDDLE  ALT=\"125+=+125\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "OK \r<BR>\n" );
document.write( "\n" );
document.write( "  </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );