To find the time it takes for a person to go around the square park 5 times, we need to find the distance around the park and divide it by the personâ€™s speed.

The area of the square park is given as 2500 square meters. Since it is a square, we can find the length of one side by taking the square root of the area: âˆš2500 = 50 meters.

The distance around the park is equal to the perimeter of the square, which is 4 times the length of one side: 4 * 50 = 200 meters.

The person works at a rate of 4 km per hour, which is equal to 4000 meters per hour.

To find the time it takes to go around the park 5 times, we divide the distance around the park by the personâ€™s speed: 5 * 200 / 4000 = 1/4 hour.

Therefore, it will take the person 1/4 hour, or 15 minutes, to go around the square park 5 times.