document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=25194>Question 25194</A>: <I><SPAN STYLE=\"word-break: break-all;\"> An elevator went from the bottom to the top of a tower at an average speed of 4 m/s, remained at the top for 90 s, and then returned to the bottom at 5 m/s.  If  the total elapsed time was 4 1/2 min., how high is the tower?<BR>\n" );
document.write( "Can you please also give the the equation you used to solve this problem?\r<BR>\n" );
document.write( "\n" );
document.write( "Thank you! </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #13513 by </B><A HREF=/tutors/aboutme.mpl?userid=Paul><B>Paul(988)</B></A><img src=\"/images/stars/stars-11.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=Paul><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=13513\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> The elvator went at 4m/s at a distacne of x<BR>\n" );
document.write( "The elvator reutrned at 5m/s at a distance of x<BR>\n" );
document.write( "Total time in SECONDS. because its meters per second. (4*2+1)/2=4.5*60=270s<BR>\n" );
document.write( "270s-90s=180s\r<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=x%2F4%2Bx%2F5=180 ALIGN=MIDDLE  ALT=\"x%2F4%2Bx%2F5=180\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "4*5 =20<BR>\n" );
document.write( "5*4=20<BR>\n" );
document.write( "Hence the common multiple is 20\r<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=20%28x%2F4%29%2B20%28x%2F5%29=20%28180%2F1%29 ALIGN=MIDDLE  ALT=\"20%28x%2F4%29%2B20%28x%2F5%29=20%28180%2F1%29\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "Simplfy the expression.<BR>\n" );
document.write( "5x+4x=3600<BR>\n" );
document.write( "9x=3600<BR>\n" );
document.write( "x=400\r<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( "Hence the tower is 400m tall.<BR>\n" );
document.write( "Paul. </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );