Question 874357
man rate, {{{1/(12*3)=1/36}}}
woman rate, {{{1/(12*5)=1/60}}}
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6 men and 5 women rate:
{{{6(1/36)+5(1/60)=6/36+5/60=1/6+1/12=2/12+1/12=3/12=1/4}}} jobs per day.  Their rates are simply combined through addition.


The reciprocal is {{{4}}} days per job.  This time is 4 days.