Question 760013
Build a Fence is 1 job.
{{{R*t=j}}}
R is rate in jobs per hour
t is time in hours
j is how many jobs.


Work in units of jobs per hour.
Sarah: {{{1/9}}} jobs per hour.
Joe: {{{1/6}}} jobs per hour.
Combined rate of Sarah AND Joe: {{{(1/6+1/9)}}} jobs per hour.