document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=351578>Question 351578</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A plane flies 390 miles with the wild and 325 miles against the wind in the same length of time. If the speed of the wind is 10 mph, find 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 #251210 by </B><A HREF=/tutors/aboutme.mpl?userid=mananth><B>mananth(16946)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=mananth><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=mananth><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=251210\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> let speed of plane in still air be x mph<BR>\n" );
document.write( "speed of wind = 10 mph<BR>\n" );
document.write( "..<BR>\n" );
document.write( "with wind 390 miles<BR>\n" );
document.write( "time taken = 390/x+10<BR>\n" );
document.write( "...<BR>\n" );
document.write( "against wind = 325 miles<BR>\n" );
document.write( "time = 325/x-10<BR>\n" );
document.write( "..<BR>\n" );
document.write( "both these times are same<BR>\n" );
document.write( "...<BR>\n" );
document.write( "325/(x-10)=390/(x+10)<BR>\n" );
document.write( "390(x-10)=325(x+10)<BR>\n" );
document.write( "390x-3900 = 325x +3900<BR>\n" );
document.write( "390x-325x=7800<BR>\n" );
document.write( "65x = 7800<BR>\n" );
document.write( "x= 7800/65<BR>\n" );
document.write( "x= 120 mph<BR>\n" );
document.write( "....<BR>\n" );
document.write( "m.ananth@hotmail.ca </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );