document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=28470>Question 28470</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A boat goes 280 miles downstream in the same time it can go 210 miles upstream.  The speen of the current is 9 miles per hour.  Find the speed of th 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 #15471 by </B><A HREF=/tutors/aboutme.mpl?userid=Paul><B>Paul(988)</B></A><img src=\"/images/stars/stars-11.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=Paul><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=15471\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Let the speed of the boat be x<BR>\n" );
document.write( "280(x-9)=210(x+9)<BR>\n" );
document.write( "280x-2520=210x+1890<BR>\n" );
document.write( "70x=4410<BR>\n" );
document.write( "x=63\r<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( "Hence, the speed of the boat is 63mph.<BR>\n" );
document.write( "PAUL. </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );