If you figure 10holes, 10 guys 10 days, I see that as each guy is digging a hole and it is completed in 10 days. Which means for one guy to dig half a hole it will take 5 days.
You did not define the size of the hole but that does not matter as you defined that it takes a 10 guys 10 days to get their 10 holes. So sticking to the uniformity of your question of 10 10 10 I would say each hole has to be the same depth.
Get ready I will try to pick apart each question you post.
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