document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=172574>Question 172574</A>: <I><SPAN STYLE=\"word-break: break-all;\"> The Rat River flows at a rate of 5 km/h. In order for a boat to travel 75 km upriver and then return in a total of 8 hr, how fast must the boal travel 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 #127454 by </B><A HREF=/tutors/aboutme.mpl?userid=checkley77><B>checkley77(12844)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=checkley77><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=127454\">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( "8=75/(R-5)+75/(R+5)<BR>\n" );
document.write( "8=[75(R+5)+75(R-5)]/(R-5)(R+5)<BR>\n" );
document.write( "8=[75R+375+75R-375]/(R^2-25)<BR>\n" );
document.write( "8R^2-200=150R<BR>\n" );
document.write( "8R^2-150R-200=0<BR>\n" );
document.write( "(8R+10)(R-20)=0<BR>\n" );
document.write( "R-20=0<BR>\n" );
document.write( "R=20 KM/H IS THE SPEED OF THE BOAT.<BR>\n" );
document.write( "PROOF:<BR>\n" );
document.write( "8=75/15+75/25<BR>\n" );
document.write( "8=5+3<BR>\n" );
document.write( "8=8\r<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );