Final answer:
The four fudge machines can produce a total of 120 fudges in 3 hours.
Step-by-step explanation:
The four fudge machines can produce a total of 10 fudges per hour each. So, in 1 hour, they can produce a total of 10 x 4 = 40 fudges. Therefore, in 3 hours, they can produce a total of 40 x 3 = 120 fudges.