document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=169934>Question 169934</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A boat can travel 36 mmiles downstream in 2 hours. Coming back upstream the trip takes 3 hours. Find the rate of the boat in still water and the rate of the current. <BR>\n" );
document.write( "b be average speed of boat, <BR>\n" );
document.write( "c = average current.<BR>\n" );
document.write( "gives<BR>\n" );
document.write( "2(b+c)= 36<BR>\n" );
document.write( "3(b-c)= 36<BR>\n" );
document.write( "expanding<BR>\n" );
document.write( "..<BR>\n" );
document.write( "2b+2c=36....divide by 2, b+c=18 giving 3b+3c=54<BR>\n" );
document.write( "3b-3c=36..given<BR>\n" );
document.write( "..\r<BR>\n" );
document.write( "\n" );
document.write( "3b+3c=54...eqn 1<BR>\n" );
document.write( "3b-3c=36...eqn 2<BR>\n" );
document.write( "subtract eqn 2 from 1<BR>\n" );
document.write( "6c=18<BR>\n" );
document.write( "c=3<BR>\n" );
document.write( "b=15\r<BR>\n" );
document.write( "\n" );
document.write( "Rate of boat = 15 mph<BR>\n" );
document.write( "Current      =  3mph\r<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( " </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #125369 by </B><A HREF=/tutors/aboutme.mpl?userid=rajagopalan><B>rajagopalan(174)</B></A><img src=\"/images/stars/stars-09.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=rajagopalan><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=rajagopalan><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=125369\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Let <BR>\n" );
document.write( "b be average speed of boat, <BR>\n" );
document.write( "c = average current.<BR>\n" );
document.write( "gives<BR>\n" );
document.write( "2(b+c)= 36<BR>\n" );
document.write( "3(b-c)= 36<BR>\n" );
document.write( "expanding<BR>\n" );
document.write( "..<BR>\n" );
document.write( "2b+2c=36....divide by 2, b+c=18 giving 3b+3c=54<BR>\n" );
document.write( "3b-3c=36..given<BR>\n" );
document.write( "..\r<BR>\n" );
document.write( "\n" );
document.write( "3b+3c=54...eqn 1<BR>\n" );
document.write( "3b-3c=36...eqn 2<BR>\n" );
document.write( "subtract eqn 2 from 1<BR>\n" );
document.write( "6c=18<BR>\n" );
document.write( "c=3<BR>\n" );
document.write( "b=15<BR>\n" );
document.write( "...<BR>\n" );
document.write( "Answer:<BR>\n" );
document.write( "Rate of boat = 15 mph<BR>\n" );
document.write( "Current      =  3mph\r<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );