To determine who ran 2.12 km in 45 minutes, we need to look at the distances covered by each participant at the 45-minute mark based on the graph provided in your description.
From the graph:
- Bella reached 3.5 km in 45 minutes.
- Ruby reached 2.5 km in 40 minutes (not applicable here).
- Greg reached 2.5 km in 45 minutes.
- Paul reached 1 km in 25 minutes (not applicable here).
Based on this information, at the 45-minute mark, both Bella and Greg are mentioned. However, Greg's distance is 2.5 km, while Bella's is 3.5 km.
Since none of the runners specifically ran 2.12 km in 45 minutes based on the data, but you may be looking for which one is closest in distance covered. Since both Bella and Greg were at the 45-minute mark, the closest to running just over 2 km at that time would be Greg, as he ran 2.5 km.
Thus, the answer is Greg.