Final answer:
The total length of the fence needed to enclose the rectangular field is 650 feet.
Step-by-step explanation:
To find the total length of the fence, we need to calculate the perimeter of the rectangular field. The formula for the perimeter of a rectangle is P = 2L + 2W, where L is the length and W is the width.
Given that the length of the field is 125 feet and the width is 200 feet, we can substitute these values into the formula:
P = 2(125) + 2(200) = 250 + 400 = 650 feet
Therefore, the total length of the fence needed is 650 feet.