document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=116160>Question 116160</A>This question is from textbook <A HREF=http://www.amazon.com/exec/obidos/ASIN/0321269470/algebrahomeworkh></A><BR>\n" );
document.write( ": <I><SPAN STYLE=\"word-break: break-all;\"> A plane flies 400 miles with the wind and 320 miles against the wind in the same length of time. If the speed of the wind is 25 mph, what is the speed of the plane in still air? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #84459 by </B><A HREF=/tutors/aboutme.mpl?userid=checkley71><B>checkley71(8403)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=checkley71><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=84459\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> DISTANCE=RATE*TIME.<BR>\n" );
document.write( "OR T=DISTANCE/RATE.<BR>\n" );
document.write( "BECAUSE THE TIMES ARE THE SAME WE HAVE THE FOLLOWING EQUATION:<BR>\n" );
document.write( "400/(R+25)=320/(R-25) CROSS MULTIPLY.<BR>\n" );
document.write( "400(R-25)=320(R+25)<BR>\n" );
document.write( "400R-10,000=320R+8000<BR>\n" );
document.write( "400R-320R=800+18,000<BR>\n" );
document.write( "80R=18000<BR>\n" );
document.write( "R=18,000/80<BR>\n" );
document.write( "R=225 MPH FOR THE SPEED OF THE PLANE.<BR>\n" );
document.write( "PROOF<BR>\n" );
document.write( "400/(225+25)=320/(225-25)<BR>\n" );
document.write( "400/250=320/(200)<BR>\n" );
document.write( "1.6=1.6\r<BR>\n" );
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document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );