document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=890364>Question 890364</A>: <I><SPAN STYLE=\"word-break: break-all;\"> The current in a stream moves at a speed of 5 km/h. A boat travels 39 km upstream and 39 km downstream in a total time of 12 hours. What is the speed of the boat in still water? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #538925 by </B><A HREF=/tutors/aboutme.mpl?userid=Alan3354><B>Alan3354(69443)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=Alan3354><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=Alan3354><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=538925\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> d = r*t<BR>\n" );
document.write( "t = d/r<BR>\n" );
document.write( "39/(b+5) + 39/(b-5) = 12<BR>\n" );
document.write( "13/(b+5) + 13/(b-5) = 4<BR>\n" );
document.write( "15(b+5) + 13(b-5) = 4(b^2-5)<BR>\n" );
document.write( "26b = 4b^2 - 20<BR>\n" );
document.write( "2b^2 - 13b - 10 = 0<BR>\n" );
document.write( "Solve for b<BR>\n" );
document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );