document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=335696>Question 335696</A>: <I><SPAN STYLE=\"word-break: break-all;\"> I am having a hard time figuring this word problem out. Can you please help.<BR>\n" );
document.write( "Upstream, downstream. Junior’s boat will go 15 miles per<BR>\n" );
document.write( "hour in still water. If he can go 12 miles downstream in the<BR>\n" );
document.write( "same amount of time as it takes to go 9 miles upstream,<BR>\n" );
document.write( "then what is 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 #240698 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=240698\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Junior’s boat will go 15 miles per hour in still water. <BR>\n" );
document.write( "If he can go 12 miles downstream in the <BR>\n" );
document.write( "same amount of time as it takes to go 9 miles upstream,<BR>\n" );
document.write( "then what is the speed of the current?<BR>\n" );
document.write( "---<BR>\n" );
document.write( "Downstream DATA:<BR>\n" );
document.write( "distance = 12 miles ; rate = 15+c mph ; time = d/r = 12/(15+c) hrs<BR>\n" );
document.write( "--------------------<BR>\n" );
document.write( "Upstream DATA:<BR>\n" );
document.write( "distance = 9 miles ; rate = 15-c mph ; time = d/r = 9/(15-c) hrs<BR>\n" );
document.write( "--------------------<BR>\n" );
document.write( "Equation:<BR>\n" );
document.write( "time up = time down<BR>\n" );
document.write( "8/(15-c) = 12/(15+c)<BR>\n" );
document.write( "9(15+c) = 12(15-c)<BR>\n" );
document.write( "9*15+9c = 12*15-12c<BR>\n" );
document.write( "21c = 3(15)<BR>\n" );
document.write( "c = (1/7)15<BR>\n" );
document.write( "c = 2.5 mph (speed of the current)<BR>\n" );
document.write( "=======================================<BR>\n" );
document.write( "Cheers,<BR>\n" );
document.write( "Stan H.<BR>\n" );
document.write( "===============<BR>\n" );
document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );