document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=620028>Question 620028</A>: <I><SPAN STYLE=\"word-break: break-all;\"> the speed of the boat in still water is 11km/hr.it can go 12km upstream and return downstream to the original point in 2hrs 45min. find the speed of the stream. </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #389879 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=389879\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> the speed of the boat in still water is 11km/hr.it can go 12km upstream and return downstream to the original point in 2hrs 45min. find the speed of the stream.<BR>\n" );
document.write( "**<BR>\n" );
document.write( "let x=speed of stream<BR>\n" );
document.write( "11+x=speed of boat downstream<BR>\n" );
document.write( "11-x=speed of boat upstream<BR>\n" );
document.write( "2 hr and 45 min=2.75 hr<BR>\n" );
document.write( "Travel time=distance/speed<BR>\n" );
document.write( "**<BR>\n" );
document.write( "12/(11+x)+12/(11-x)=2.75<BR>\n" );
document.write( "LCD:(11+x)(11-x)<BR>\n" );
document.write( "12(11-x)+12(11+x)=2.75(11+x)(11-x)=2.75(121-x^2)=332.75-2.75x^2<BR>\n" );
document.write( "132-12x+132+12x=332.75-2.75x^2<BR>\n" );
document.write( "264=332.75-2.75x^2<BR>\n" );
document.write( "2.75x^2=332.75-264=68.75<BR>\n" );
document.write( "x^2=68.75/2.75=25<BR>\n" );
document.write( "x=5<BR>\n" );
document.write( "speed of stream= 5 km/hr </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );