document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=170298>Question 170298</A>This question is from textbook <A HREF=http://www.amazon.com/exec/obidos/ASIN/0395977258/algebrahomeworkh>algebra and trigonemetry structure and method book 2</A><BR>\n" );
document.write( ": <I><SPAN STYLE=\"word-break: break-all;\"> a town's old street sweeper can clean the streets in 60 h. the old sweeper together with the new sweeper can clean the streeats in 15 h.  how long would it take the new sweeper to do the job alone? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #125715 by </B><A HREF=/tutors/aboutme.mpl?userid=checkley77><B>checkley77(12844)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=checkley77><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=125715\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> 60x/(60+x)=15<BR>\n" );
document.write( "60x=15(60+x)<BR>\n" );
document.write( "60x=900+15x<BR>\n" );
document.write( "60x-15x=900<BR>\n" );
document.write( "45x=900<BR>\n" );
document.write( "x=900/45<BR>\n" );
document.write( "x=20 hours for the new sweeper working alone.<BR>\n" );
document.write( "Proof:<BR>\n" );
document.write( "60*20/(60+20)=15<BR>\n" );
document.write( "1200/80=15<BR>\n" );
document.write( "15=15<BR>\n" );
document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );