Question 1030345
Time unit is HOURs and one job is GRADE ALL THE EXAMS, and you can just call this 1 JOB.


<pre>
Graders              RATE as JOBS/HOURS

Teacher&Asst           {{{1/4}}}

Teacher                {{{1/t}}}

Assistant              {{{1/(t+1)}}}</pre>


Study that table of data and be sure you understand how to form it.  See that the time for the teacher to do ONE job is assigned to {{{t}}}.  Any variable could have been chosen.


Rate of people combined to do the same task are to be simply summed.
{{{highlight_green(1/t+1/(t+1)=1/4)}}}.
You can very likely do the rest of this.  Say if otherwise and if you post another on the site for this same question, include the question number #1030345.