document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1110220>Question 1110220</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A child is running on a moving sidewalk in an airport. When she runs against the sidewalk's motion, she travels <BR>\n" );
document.write( "50ft<BR>\n" );
document.write( " in <BR>\n" );
document.write( "10<BR>\n" );
document.write( " seconds. When she runs with the sidewalk's motion, she travels <BR>\n" );
document.write( "91ft<BR>\n" );
document.write( " in <BR>\n" );
document.write( "13<BR>\n" );
document.write( " seconds. What is the rate of the child on a still sidewalk and what is the rate of the moving sidewalk? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #725231 by </B><A HREF=/tutors/aboutme.mpl?userid=ankor@dixie-net.com><B>ankor@dixie-net.com(22740)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=ankor@dixie-net.com><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=ankor@dixie-net.com><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=725231\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> A child is running on a moving sidewalk in an airport.<BR>\n" );
document.write( " When she runs against the sidewalk's motion, she travels 50ft in 10 seconds.<BR>\n" );
document.write( " When she runs with the sidewalk's motion, she travels 91ft in 13 seconds.<BR>\n" );
document.write( " What is the rate of the child on a still sidewalk and what is the rate of the moving sidewalk?<BR>\n" );
document.write( "let w = the walking speed of the child<BR>\n" );
document.write( "let s = the moving sidewalk speed<BR>\n" );
document.write( "Write an equation for each way<BR>\n" );
document.write( "10(w-s) = 50<BR>\n" );
document.write( "13(w+s) = 91<BR>\n" );
document.write( "simplify both equation; divide 1st eq by 10, the 2nd eq by 13, we have<BR>\n" );
document.write( "w - s = 5<BR>\n" );
document.write( "w + s = 7<BR>\n" );
document.write( "----------addition eliminates s, find w<BR>\n" );
document.write( "2w = 12<BR>\n" );
document.write( "w = 6 ft/sec on a still sidewalk<BR>\n" );
document.write( "Find s<BR>\n" );
document.write( "6 + s = 7<BR>\n" );
document.write( "s = 1 ft/sec is speed of the moving sidewalk </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );