document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=383447>Question 383447</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A boat traveling at 10 mph can go 20 miles against a current in the same time it can go 60 miles with the current.  How fast is the current of this river? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #271480 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=271480\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> let current rate = xmph<BR>\n" );
document.write( "rate upstream = 10-x<BR>\n" );
document.write( "..<BR>\n" );
document.write( "time upstream = 20/(10-x)<BR>\n" );
document.write( "....<BR>\n" );
document.write( "time downstream = 60/(10+x)<BR>\n" );
document.write( "..<BR>\n" );
document.write( "time downstream = time upstream<BR>\n" );
document.write( "20/(10-x)= 60/(10+x)<BR>\n" );
document.write( "cross multiply<BR>\n" );
document.write( "20(10+x)=60(10-x)<BR>\n" );
document.write( "200+20x=600-60x<BR>\n" );
document.write( "80x=400<BR>\n" );
document.write( "/80<BR>\n" );
document.write( "x=400/80<BR>\n" );
document.write( "x= 5 mph<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+speed+of+current=%28highlight%285mph%29%29 ALIGN=MIDDLE  ALT=\"+speed+of+current=%28highlight%285mph%29%29\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "...<BR>\n" );
document.write( "m.ananth@hotmail.ca </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );