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he will dig 7 1 and 1/2 holes
You cannot dig half a hole. It may be only half as big, but it is still a hole. So the answer is a moment. This is an old, old riddle/joke.
It takes 3 x 6 = 18 man hours to dig 12 holes. Therefore it takes 18/12 = 1.5 man hours to dig 1 hole. To dig 9 holes takes 9 x 1.5 man hours = 13.5 man hours If 2 men are working then they take 13.5/2 = 6.75 hours or 6 hours 45 minutes.
You can't dig half a hole. If you dig there is a hole.
Assuming they can work in parallel, the answer should be 5. 5 men produce 1 hole per hour in the first example. At that rate, they produce 5 holes in 5 hours. The same 5 men, working at one hole per hour, should be able to produce 100 holes in 100 hours (assuming they don't need sleep, etc.)