Final answer:
The length of the arc is 1 unit.
Step-by-step explanation:
The length of the arc can be found using the formula:
arc length = (central angle / 360 degrees) x circumference
Given that the central angle is 60 degrees and the circumference is 6, we can substitute these values into the formula:
arc length = (60 / 360) x 6 = 1 unit