document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=211498>Question 211498</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Patty the Paddler paddles her paddle boat at a constant 12km/h. She paddles 21km upstream and 34 km downstream in a total of 5 hours. What is the speed of the current? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #159903 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=159903\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> D=RT<BR>\n" );
document.write( "T=D/R<BR>\n" );
document.write( "X=21/(12-R)<BR>\n" );
document.write( "12X-RX=21<BR>\n" );
document.write( "5-X=34/(12+R)<BR>\n" );
document.write( "X=21/(12-R)<BR>\n" );
document.write( "--------------<BR>\n" );
document.write( "5=34/(12+R)+21/(12-R)<BR>\n" );
document.write( "5=[34(12-R)+21(12+R)]/(12+R)(12-R)<BR>\n" );
document.write( "5=[408-34R+252+21R]/(144-R^2)<BR>\n" );
document.write( "5(144-R^2)=13R+660<BR>\n" );
document.write( "720-5R^2-13R-660=0<BR>\n" );
document.write( "-5R^2-13R+60=0<BR>\n" );
document.write( "5R^2-13R-60=0<BR>\n" );
document.write( "(5R+12)(R-5)=0<BR>\n" );
document.write( "R-5=0<BR>\n" );
document.write( "R=5 KM/H. ANS. FOR THE CURRENT.<BR>\n" );
document.write( "PROOF:<BR>\n" );
document.write( "5=34/(12+5)+21/(12-5)<BR>\n" );
document.write( "5=34/17+21/7<BR>\n" );
document.write( "5=2+3<BR>\n" );
document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );