<PRE><B>Question 937020</B>
Rates r, p, g.


The work rate of people working on the job at the same time is the sum of their rates.  The unit for a rate is JOBS per DAY for your example problem.


{{{system(r+p=1/10,r+g=1/8,p+g=1/12)}}}


The numbers r, p, g handled in this way will be fractions.</PRE>