document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=185485>Question 185485</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Solve Problems Using Linear Systems<BR>\n" );
document.write( "7. Tyler rows 10 km downstream in 2 h. On the return trip, it takes hom 4 h to travel 8 km. Determine his average rowing speed and the speed of the current.<BR>\n" );
document.write( "(answrs are: average rowing speed 3.5 km/h, speed of current 1.5 km/h, but i dont know how to solve  it?) </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #139143 by </B><A HREF=/tutors/aboutme.mpl?userid=stanbon><B>stanbon(75887)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=stanbon><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=139143\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Tyler rows 10 km downstream in 2 h. On the return trip, it takes hom 4 h to travel 8 km. Determine his average rowing speed and the speed of the current.<BR>\n" );
document.write( "------------------------------------------<BR>\n" );
document.write( "Downstream DATA:<BR>\n" );
document.write( "distance = 10 km ; time = 2h ; rate = 5 km/h<BR>\n" );
document.write( "---------------------------------<BR>\n" );
document.write( "Upstream DATA:<BR>\n" );
document.write( "distance = 8 km ; time = 4 hr ; rate = 2 km/h<BR>\n" );
document.write( "--------------------------------<BR>\n" );
document.write( "Equations:<BR>\n" );
document.write( "b + c = 5<BR>\n" );
document.write( "b - c = 2<BR>\n" );
document.write( "------------<BR>\n" );
document.write( "Add to solve for \"b\":<BR>\n" );
document.write( "2b = 7<BR>\n" );
document.write( "b = 3.5 km/h (speed of the boat in still water)<BR>\n" );
document.write( "-------------------<BR>\n" );
document.write( "substitute into b+c = 5 to solve for \"c\":<BR>\n" );
document.write( "3.5 + c = 5<BR>\n" );
document.write( "c = 1.5 km/h speed of the current)<BR>\n" );
document.write( "============================================<BR>\n" );
document.write( "cheers,<BR>\n" );
document.write( "Stan H. </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );