document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=640335>Question 640335</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Please help me solve this word problem: A certain plane flying with the wind travels 540 km in 2 hours. Later, flying against the same wind, the plane travels 690 km in 3 hours. Find the speed of the plane in still air and the speed of the wind. </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #403161 by </B><A HREF=/tutors/aboutme.mpl?userid=sachi><B>sachi(548)</B></A><img src=\"/images/stars/stars-10.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=sachi><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=sachi><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=403161\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> let the speed of the plane in still air =x<BR>\n" );
document.write( "and the speed of the wind=y<BR>\n" );
document.write( "flying with the wind travels 540 km in 2 hours<BR>\n" );
document.write( "so 2[x+y]=540 <BR>\n" );
document.write( "or x+y=270  ----1<BR>\n" );
document.write( " Later, flying against the same wind, the plane travels 690 km in 3 hours<BR>\n" );
document.write( "so 3[x-y]=690<BR>\n" );
document.write( "  or x-y=230   ---------2<BR>\n" );
document.write( "adding 1   & 2<BR>\n" );
document.write( "2x=500 or x=250 km/hr =speed of aeroplane<BR>\n" );
document.write( "from 1 y=270-250=20 km/hr = speed of air<BR>\n" );
document.write( "ans </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );