document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=922685>Question 922685</A>: <I><SPAN STYLE=\"word-break: break-all;\"> a boat travels 45 mi upstream (against the current) in 5h. The boat travels the same distance downstream in 3h. What is the rate 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 #559676 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=559676\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> a boat travels 45 mi upstream (against the current) in 5h. The boat travels the same distance downstream in 3h. What is the rate of the current?<BR>\n" );
document.write( "***<BR>\n" );
document.write( "let x=rate of boat in still water<BR>\n" );
document.write( "let c=rate of current<BR>\n" );
document.write( "(x+c)=rate of boat downstream<BR>\n" );
document.write( "(x-c)=rate of boat upstream<BR>\n" );
document.write( "distance/rate=travel time<BR>\n" );
document.write( "45/(x-c)=5<BR>\n" );
document.write( "45/(x+c)=3<BR>\n" );
document.write( "..<BR>\n" );
document.write( "5x-5c=45<BR>\n" );
document.write( "3x+3c=45<BR>\n" );
document.write( "..<BR>\n" );
document.write( "15x-15c=135 (mult. eq by 3)<BR>\n" );
document.write( "15x+15c=225 (mult. eq by 5)<BR>\n" );
document.write( "subtract:<BR>\n" );
document.write( "-30c=-90<BR>\n" );
document.write( "c=3<BR>\n" );
document.write( "What is the rate of the current? 3 mph </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );