document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=399882>Question 399882</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A duck can fly 1800 m in 10 min with the wind. Against the wind, it can fly only 2/3 of this distance in 10 min. How fast can the duck fly in still air? What is the rate of the wind. <BR>\n" );
document.write( "**PLEASE USE THE VARIABLES R for rate duck speed in still air and C for rate of wind. IF YOU DO NOT..I WILL GET CONFUSED SINCE I AM USING THOSE AND ONLY THOSE VARIABLES. </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #283110 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=283110\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> A duck can fly 1800 m in 10 min with the wind. Against the wind, it can fly only 2/3 of this distance in 10 min. How fast can the duck fly in still air? What is the rate of the wind. <BR>\n" );
document.write( "**PLEASE USE THE VARIABLES R for rate duck speed in still air and C for rate of wind. IF YOU DO NOT..I WILL GET CONFUSED SINCE I AM USING THOSE AND ONLY THOSE VARIABLES.\r<BR>\n" );
document.write( "\n" );
document.write( "..<BR>\n" );
document.write( "duck rate = r<BR>\n" );
document.write( "wind rate = c<BR>\n" );
document.write( "...<BR>\n" );
document.write( "with wind, rate = r+c<BR>\n" );
document.write( "against wind, rate =r-c<BR>\n" );
document.write( "..<BR>\n" );
document.write( "distance , with wind = 1800 m<BR>\n" );
document.write( "distance,against wind 2/3*1800=1200 m<BR>\n" );
document.write( "...<BR>\n" );
document.write( "time with wind = 10 minutes====> 1/6 hours<BR>\n" );
document.write( "time, against wind =10 minutes====>1/6 hours<BR>\n" );
document.write( "...<BR>\n" );
document.write( "1800/(r+c)=1/6<BR>\n" );
document.write( "cross multiply<BR>\n" );
document.write( "r+c=10800......................1<BR>\n" );
document.write( "...<BR>\n" );
document.write( "1200/(r-c)=1/6<BR>\n" );
document.write( "cross multiply<BR>\n" );
document.write( "r-c=7200.......................2<BR>\n" );
document.write( "...<BR>\n" );
document.write( "add (1)&(2)<BR>\n" );
document.write( "2r=18000<BR>\n" );
document.write( "/2<BR>\n" );
document.write( "r=9000 m/minute rate of bird in still air<BR>\n" );
document.write( "...<BR>\n" );
document.write( "r+c=10,800<BR>\n" );
document.write( "9000+c=10,800<BR>\n" );
document.write( "c=9,000-8,800<BR>\n" );
document.write( "c=1800 m/minute\r<BR>\n" );
document.write( "\n" );
document.write( "..<BR>\n" );
document.write( "m.ananth@hotmail.ca </SPAN>\n" );
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