document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=442916>Question 442916</A>: <I><SPAN STYLE=\"word-break: break-all;\"> The speed of a boat in still water is 10 km/h. The boat travels 12 km upstream and 28 km downstream in a total time of 4 hours. What is the speed of the stream? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #308208 by </B><A HREF=/tutors/aboutme.mpl?userid=jorel1380><B>jorel1380(3719)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=jorel1380><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=jorel1380><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=308208\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> 12/(10-x)+28/(10+x)=4<BR>\n" );
document.write( "12(10+x)+28(10-x)=400-4x2<BR>\n" );
document.write( "120+12x+280-28x=400-4x2<BR>\n" );
document.write( "4x2-16x=0<BR>\n" );
document.write( "x2-4x=0<BR>\n" );
document.write( "x2=4x<BR>\n" );
document.write( "x=4<BR>\n" );
document.write( "The speed of the stream is 4 kph.. </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );