document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=715565>Question 715565</A>: <I><SPAN STYLE=\"word-break: break-all;\"> a sailor sails a distance of 48 km along the flow of a river in 8 hr . if it take 12 hr to return the same distance , then the speed of the river is ? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #439494 by </B><A HREF=/tutors/aboutme.mpl?userid=DrBeeee><B>DrBeeee(684)</B></A><img src=\"/images/stars/stars-11.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=DrBeeee><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=439494\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Let s = the speed of the boat<BR>\n" );
document.write( "Let r = speed of the river<BR>\n" );
document.write( "When traveling with the river the sailor travels 48km in 8hr, then we have<BR>\n" );
document.write( "(1) s + r = 48/8 or<BR>\n" );
document.write( "(2) s + r = 6<BR>\n" );
document.write( "When going up the river he travels 48km in 12hr, then we have<BR>\n" );
document.write( "(3) s - r = 48/12 or<BR>\n" );
document.write( "(4) s - r = 4<BR>\n" );
document.write( "Add (2) and (4) and get<BR>\n" );
document.write( "(5) 2*s = 10 or<BR>\n" );
document.write( "(6) s = 5<BR>\n" );
document.write( "Use (6) in (2) and get<BR>\n" );
document.write( "(7) 5 + r = 6 or<BR>\n" );
document.write( "(8) r = 1<BR>\n" );
document.write( "Let's check the answers with (4).<BR>\n" );
document.write( "Is (5 - 1 = 4)?<BR>\n" );
document.write( "Is (4 = 4)? Yes<BR>\n" );
document.write( "Answer: The river is flowing at 1km/hr. </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );