document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1084695>Question 1084695</A>: <I><SPAN STYLE=\"word-break: break-all;\"> if the speed of an aeroplane is reduced by 40km per hr,it takes 20 minutes more  to cover 1200km. find  the speed of the aeroplane. </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #698749 by </B><A HREF=/tutors/aboutme.mpl?userid=Boreal><B>Boreal(15235)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=Boreal><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=Boreal><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=698749\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> speed*time=distance<BR>\n" );
document.write( "x is base speed of plane<BR>\n" );
document.write( "x*t=1200<BR>\n" );
document.write( "(x-40)(t+(1/3))=1200<BR>\n" );
document.write( "so xt=xt+(1/3)x-40t-40/3<BR>\n" );
document.write( "0=(1/3)x-40t-40/3; x=1200/t<BR>\n" );
document.write( "0=(400/t)-40t-(40/3)<BR>\n" );
document.write( "multiply by 3t<BR>\n" );
document.write( "0=1200-120t^2-40t<BR>\n" );
document.write( "120t^2-40t-1200=0<BR>\n" );
document.write( "3t^2-t-30=0<BR>\n" );
document.write( "(3t-10)(t+3)=0<BR>\n" );
document.write( "t=10/3 hours, only positive root.<BR>\n" );
document.write( "x*10/3=1200<BR>\n" );
document.write( "10x=3600<BR>\n" );
document.write( "x=360 km/h, ANSWER, and it will take 3 1/3 hours to go 1200 km<BR>\n" );
document.write( "x-40=320 km/h, and it will take 3 2/3 hours (20 more minutes) to go 1200 km.<BR>\n" );
document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );