document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=769209>Question 769209</A>: <I><SPAN STYLE=\"word-break: break-all;\"> The speed of a stream is 5 mph. If a boat travels 86 mi downstream in the same time that it takes to 18) travel 43 mi upstream, 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 #468706 by </B><A HREF=/tutors/aboutme.mpl?userid=Cromlix><B>Cromlix(4381)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=Cromlix><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=Cromlix><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=468706\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Speed of boat = x<BR>\n" );
document.write( "86/x + 5 = 43/x - 5<BR>\n" );
document.write( "Cross multiply<BR>\n" );
document.write( "86(x - 5) = 43(x + 5)<BR>\n" );
document.write( "86x - 430 = 43x + 215<BR>\n" );
document.write( "86x - 43x = 215 + 430<BR>\n" );
document.write( "43x = 645<BR>\n" );
document.write( "x = 15<BR>\n" );
document.write( "Speed of boat = 15mph<BR>\n" );
document.write( "Hope this helps.<BR>\n" );
document.write( ":-) </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );