document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1115356>Question 1115356</A>: <I><SPAN STYLE=\"word-break: break-all;\"> The speed of a stream is 4 mph. A boat travels 11 miles upstream in the same time it takes to travel 19 miles downstream. What is the speed of the boat in still&#8203; water? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #730224 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=730224\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\">  The speed of a stream is 4 mph. A boat travels 11 miles upstream in the same time it takes to travel 19 miles downstream. What is the speed of the boat in still&#8203; water? <BR>\n" );
document.write( "------<BR>\n" );
document.write( "Upstream DATA:<BR>\n" );
document.write( "dist = 11 miles ; rate = b-4 mph ; time = d/r = 11/(b-4)<BR>\n" );
document.write( "Downstream DATA:<BR>\n" );
document.write( "dist = 19 miles ; rate = b+4 mph ; time = d/r = 19/(b+4)<BR>\n" );
document.write( "-----<BR>\n" );
document.write( "Equation:<BR>\n" );
document.write( "time up = time down<BR>\n" );
document.write( "11/(b-4) = 19/(b+4)<BR>\n" );
document.write( "11b+44 = 19b - 76<BR>\n" );
document.write( "8b = 120<BR>\n" );
document.write( "b = 15 mph (speed of the boat in calm water)<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" );