document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=671360>Question 671360</A>: <I><SPAN STYLE=\"word-break: break-all;\"> a boat can travel on a river 4 miles upstream in the same time it takes to travel 7 miles downstream. find the speed of the current if the speed of the boat in still water is 11 miles per hour </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #417372 by </B><A HREF=/tutors/aboutme.mpl?userid=stanbon><B>stanbon(75887)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=stanbon><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=417372\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> a boat can travel on a river 4 miles upstream in the same time it takes to travel 7 miles downstream. find the speed of the current if the speed of the boat in still water is 11 miles per hour<BR>\n" );
document.write( "------<BR>\n" );
document.write( "Upstream DATA:<BR>\n" );
document.write( "distance = 4 miles ; rate = 11-c ; time = 4/(11-c)<BR>\n" );
document.write( "-----------------<BR>\n" );
document.write( "Downstream DATA:<BR>\n" );
document.write( "distance = 7 miles ; rate = 11+c ; time = 7/(11+c)<BR>\n" );
document.write( "-------<BR>\n" );
document.write( "Equation:<BR>\n" );
document.write( "time = time<BR>\n" );
document.write( "4/(11-c) = 7/(11+c)<BR>\n" );
document.write( "4(11+c) = 7(11-c)<BR>\n" );
document.write( "44 + 4c = 77-7c<BR>\n" );
document.write( "11c = 33<BR>\n" );
document.write( "c = 3 mph (speed of the current)<BR>\n" );
document.write( "=====================<BR>\n" );
document.write( "Cheers,<BR>\n" );
document.write( "Stan H.<BR>\n" );
document.write( "----------------- </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );