document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=515490>Question 515490</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A small plane can fly 240 km in 3 hours with the wind, but only 210 km in the same time against the wind. Find the rate of 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 #344007 by </B><A HREF=/tutors/aboutme.mpl?userid=lwsshak3><B>lwsshak3(11628)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=lwsshak3><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=344007\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> A small plane can fly 240 km in 3 hours with the wind, but only 210 km in the same time against the wind. Find the rate of speed of the wind.<BR>\n" );
document.write( "**<BR>\n" );
document.write( "let x=speed of plane in still air<BR>\n" );
document.write( "let c=speed of wind<BR>\n" );
document.write( "(x+c)=speed of plane downwind<BR>\n" );
document.write( "(x-c)=speed of plane upwind<BR>\n" );
document.write( "..<BR>\n" );
document.write( "240/(x+c)=3<BR>\n" );
document.write( "210/(x-c)=3<BR>\n" );
document.write( "..<BR>\n" );
document.write( "3x+3c=240<BR>\n" );
document.write( "3x-3c=210<BR>\n" );
document.write( "6c=30<BR>\n" );
document.write( "c=5<BR>\n" );
document.write( "..<BR>\n" );
document.write( "6x=450<BR>\n" );
document.write( "x=75<BR>\n" );
document.write( "ans:<BR>\n" );
document.write( "Rate of speed of the wind=5 mph </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );