document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=769242>Question 769242</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A plane can travel 910 miles with a 35 mph tailwind in the same time it can travel 760 miles with a 40 mph headwind. How fast can the plane travel with no wind resistance? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #468723 by </B><A HREF=/tutors/aboutme.mpl?userid=josgarithmetic><B>josgarithmetic(39800)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=josgarithmetic><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=468723\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Basic concept is r*t=d, r rate, t time, d distance.<BR>\n" );
document.write( "Including tailwind help, rate is r+35.<BR>\n" );
document.write( "Including headwind hindrance, rate is r-40.\r<BR>\n" );
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document.write( "910 mph with tailwind, time t, distance unknown.<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=r%2B35=910%2Ft ALIGN=MIDDLE  ALT=\"r%2B35=910%2Ft\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "760 mph with headwind, time t, distance unknown.<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=r-40=760%2Ft ALIGN=MIDDLE  ALT=\"r-40=760%2Ft\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "Those two equations just use the meaning of rate for traveling or motion.  MILES per TIME.  \r<BR>\n" );
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document.write( "\"in the same time...\" The value for t is the same number in both equations.<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=t%28r%2B35%29=910 ALIGN=MIDDLE  ALT=\"t%28r%2B35%29=910\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=t=910%2F%28r%2B35%29 ALIGN=MIDDLE  ALT=\"t=910%2F%28r%2B35%29\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "and <BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=t%28r-40%29=760 ALIGN=MIDDLE  ALT=\"t%28r-40%29=760\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=t=760%2F%28r-40%29 ALIGN=MIDDLE  ALT=\"t=760%2F%28r-40%29\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "EQUATE the expressions for t:<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=highlight%28910%2F%28r%2B35%29=760%2F%28r-40%29%29 ALIGN=MIDDLE  ALT=\"highlight%28910%2F%28r%2B35%29=760%2F%28r-40%29%29\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "SOLVE FOR r. </SPAN>\n" );
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