If Jim runs around the track 3 times each day and covers a total distance of 300 meters, you can find the length of the track by dividing the total distance covered in a day by the number of laps he runs:
Length of the track = Total distance covered / Number of laps
Length of the track = 300 meters / 3 laps
Length of the track = 100 meters
Therefore, the length of the track is 100 meters.