<PRE><B>Question 35289</B>
Jennifer takes 1/3 hour to complete 1 protion
Kathy takes 1/7 hours to complete one portion
Equation:
{{{(x-1)/3+x/7}}}
{{{(7(x-1))/21+3x/21}}}
10x-7=21
10x=28
x=2.8
Hence, it took them a total of 2.8 hours or 2 hours and 48 minutes to complete the job.
Paul.</PRE>