Final answer:
The length of the track is calculated by dividing the total distance Jim runs in a day (300 meters) by the number of laps he does (3), resulting in a track length of 100 meters.
Step-by-step explanation:
If Jim is preparing for a run around the track 3 times each day and covers a total of 300 meters a day, we can find the length of the track by dividing the total distance by the number of laps. To do this, we use basic division:
Length of the track = Total distance per day ÷ Number of laps
Length of the track = 300 meters ÷ 3 laps
Length of the track = 100 meters
Therefore, the correct answer is A. 100 meters.