document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=332477>Question 332477</A>: <I><SPAN STYLE=\"word-break: break-all;\"> it took a patrol boat 5 hours to travel 80 km up a river against the current and 4 hours for the return trip with the current. find the speed of the boat in still water and the speed of the current.  </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #238256 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=238256\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> speed of boat = x kmph<BR>\n" );
document.write( "speed of current = y kmph<BR>\n" );
document.write( "..<BR>\n" );
document.write( "speed upstream = x-y ;; Time =5 hours<BR>\n" );
document.write( "speed downstream = x+y;; Time= 4 hours<BR>\n" );
document.write( "..<BR>\n" );
document.write( "distance = 80 km<BR>\n" );
document.write( "..<BR>\n" );
document.write( "80/x-y = 5<BR>\n" );
document.write( "80 =5x-5y<BR>\n" );
document.write( "16=x-y...............1<BR>\n" );
document.write( "..<BR>\n" );
document.write( "80/x+y=4<BR>\n" );
document.write( "4x+4y=80<BR>\n" );
document.write( "x+y=20...............2<BR>\n" );
document.write( "..<BR>\n" );
document.write( "add eq1 & 2<BR>\n" );
document.write( "x+y+x-y=80+16<BR>\n" );
document.write( "2x= 96<BR>\n" );
document.write( "x= 96/2<BR>\n" );
document.write( "x=48 km/h<BR>\n" );
document.write( "..<BR>\n" );
document.write( "x-y=16<BR>\n" );
document.write( "48-y=16<BR>\n" );
document.write( "y=48-16<BR>\n" );
document.write( "y=32 km/h </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );