document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1035988>Question 1035988</A>: <I><SPAN STYLE=\"word-break: break-all;\"> An airplane flying against the wind travels 430 miles in the same amount of time it would take the same plane to travel 470 miles with the wind. If the wind speed is a constant 20 miles per hour, how fast would the plane travel in still air?\r<BR>\n" );
document.write( "\n" );
document.write( "In still air, the plane would travel <BR>\n" );
document.write( " miles per hour.<BR>\n" );
document.write( "Just need to know how to compute this problem </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #650567 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=650567\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> 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;\" > mi/hr = the plane's speed in still air<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+20+ ALIGN=MIDDLE  ALT=\"+20+\"   DISABLED_style= \"max-width:90%; height:auto;\" > mi/hr = constant wind speed<BR>\n" );
document.write( "Let <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+t+ ALIGN=MIDDLE  ALT=\"+t+\"   DISABLED_style= \"max-width:90%; height:auto;\" > = time in hrs traveling both<BR>\n" );
document.write( "with the wind and against the wind<BR>\n" );
document.write( "--------------------------------------<BR>\n" );
document.write( "Equation for traveling against the wind:<BR>\n" );
document.write( "(1) <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+430+=+%28+s+-+20+%29%2At+ ALIGN=MIDDLE  ALT=\"+430+=+%28+s+-+20+%29%2At+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "Equation for traveling with the wind:<BR>\n" );
document.write( "(2) <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+470+=+%28+s+%2B+20+%29%2At+ ALIGN=MIDDLE  ALT=\"+470+=+%28+s+%2B+20+%29%2At+\"   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=+t+=+430+%2F+%28+s+-+20+%29+ ALIGN=MIDDLE  ALT=\"+t+=+430+%2F+%28+s+-+20+%29+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "Plug this into (2)<BR>\n" );
document.write( "(2) <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+470+=+%28+s+%2B+20+%29%2A%28+430+%2F+%28+s+-+20+%29+%29+ ALIGN=MIDDLE  ALT=\"+470+=+%28+s+%2B+20+%29%2A%28+430+%2F+%28+s+-+20+%29+%29+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "(2) <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+470%2A%28+s+-+20+%29+=+430%2A%28+s+%2B+20+%29+ ALIGN=MIDDLE  ALT=\"+470%2A%28+s+-+20+%29+=+430%2A%28+s+%2B+20+%29+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "(2) <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+470s+-+9400+=+430s+%2B+8600+ ALIGN=MIDDLE  ALT=\"+470s+-+9400+=+430s+%2B+8600+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "(2) <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+40s+=+18000+ ALIGN=MIDDLE  ALT=\"+40s+=+18000+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "(2) <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+s+=+450+ ALIGN=MIDDLE  ALT=\"+s+=+450+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "---------------<BR>\n" );
document.write( "The speed of the plane in still air is 450 mi/hr<BR>\n" );
document.write( "---------------<BR>\n" );
document.write( "check:<BR>\n" );
document.write( "(1) <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+430+=+%28+s+-+20+%29%2At+ ALIGN=MIDDLE  ALT=\"+430+=+%28+s+-+20+%29%2At+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "(1) <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+430+=+%28+450+-+20+%29%2At+ ALIGN=MIDDLE  ALT=\"+430+=+%28+450+-+20+%29%2At+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "(1) <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+430+=+430t+ ALIGN=MIDDLE  ALT=\"+430+=+430t+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "(1) <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+t+=+1+ ALIGN=MIDDLE  ALT=\"+t+=+1+\"   DISABLED_style= \"max-width:90%; height:auto;\" > hr<BR>\n" );
document.write( "and<BR>\n" );
document.write( "(2) <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+470+=+%28+s+%2B+20+%29%2At+ ALIGN=MIDDLE  ALT=\"+470+=+%28+s+%2B+20+%29%2At+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "(2) <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+470+=+%28+450+%2B+20+%29%2At+ ALIGN=MIDDLE  ALT=\"+470+=+%28+450+%2B+20+%29%2At+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "(2) <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+470+=+470t+ ALIGN=MIDDLE  ALT=\"+470+=+470t+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "(2) <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+t+=+1+ ALIGN=MIDDLE  ALT=\"+t+=+1+\"   DISABLED_style= \"max-width:90%; height:auto;\" > hr<BR>\n" );
document.write( "OK<BR>\n" );
document.write( "Sorry I did the whole thing -can't resist </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );