Explanation:

To determine how long it will take the man to walk around the boundary of the square field, follow these steps:

- Calculate the side length of the square field:

- The area of the field is 25 hectares, which is 250,000 square meters (1 hectare = 10,000 square meters).

- The side length of the square = v250,000 = 500 meters.

- Determine the perimeter of the field:

- The perimeter of the square = 4 × side length = 4 × 500 = 2000 meters.

- Convert walking speed to meters per minute:

- Walking speed is 5 km/hr, which is 5000 meters per hour.

- Divide by 60 to convert to meters per minute: 5000 / 60 ˜ 83.33 meters per minute.

- Calculate time to walk the perimeter:

- Time = Total distance / Speed = 2000 meters / 83.33 meters per minute ˜ 24 minutes.

- Highlight the correct option:

- Option 3: 24 minutes