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If one worker takes 6 hours and another takes 3, think in jobs per hour rather than hours per job: they do one sixth and one third of the job each hour, so together one half, so two hours. Adding the times instead of the rates is the standard error.
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Nothing yet. No other skill in the Atlas lists this one as a prerequisite.
No indexed official paper question has been tagged with MOD-04 yet. The index grows one paper at a time, and it records only question numbers, point values and our own skill tags — never the problems themselves.