document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=253758>Question 253758</A>: <I><SPAN STYLE=\"word-break: break-all;\">  Mark and Bert together can finish the job in 4 hours. How fast can Bert finish the job alone if Mark can finish it in 9 hours? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #186098 by </B><A HREF=/tutors/aboutme.mpl?userid=ptaylor><B>ptaylor(2198)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=ptaylor><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=ptaylor><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=186098\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Let x=amount of time Bert needs to finish the job working alone<BR>\n" );
document.write( "Then Bert works at the rate of 1/x job per hour<BR>\n" );
document.write( "And Mark works at the rate of 1/9 job per hour<BR>\n" );
document.write( "Mark and Bert together work at the rate of 1/4 job per hour<BR>\n" );
document.write( "So, our equation to solve is:<BR>\n" );
document.write( "1/x + 1/9 = 1/4  multiply each term by 36x<BR>\n" );
document.write( "36+4x=9x  subtract 4x from each side<BR>\n" );
document.write( "36=5x<BR>\n" );
document.write( "x=7 1/5 = 36/5  hours\r<BR>\n" );
document.write( "\n" );
document.write( "CK<BR>\n" );
document.write( "1/(36/5)+1/9=1/4<BR>\n" );
document.write( "5/36 +4/36 =1/4<BR>\n" );
document.write( "9/36=1/4<BR>\n" );
document.write( "1/4=1/4<BR>\n" );
document.write( "Hope this helps--ptaylor </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );