Question 768385
Each man contributes his own part of the job rate so rates are additive.  One man takes x times longer than x men.  


x men__________________h hours for 1 job
1 man__________________h*x hours for 1 job



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Having the one-man rate of {{{1/(hx)}}} job per hour you also can say the rate is {{{hx}}} hours per job.  

If you want the man to do work for  k hours, then:
{{{k*(1/(hx))}}} {{{hour*(job/hour)}}}
{{{k/(hx)}}} job.