Answer: 144 km/h
Step-by-step explanation:
The distance between Toronto and Waterloo is 288 km. The student traveled from Toronto to Waterloo at a speed of 96 km/h, so the total distance traveled is 288 km (96 * 3). The student traveled back from Waterloo to Toronto in 2 hours, so the average speed on the way back is 144 km/h (288 / 2).
However, we cannot know the exact speed on the way back without knowing the student's exact route. If the student took the same route on the way back, then the average speed is 144 km/h. However, if the student took a different route on the way back, then the average speed could be different. For example, if the student took a more direct route on the way back, then the average speed could be higher. If the student took a more scenic route on the way back, then the average speed could be lower.
Therefore, the best answer to the question is that the average speed on the way back is 144 km/h assuming the student took the same route back.