Final answer:
Without additional details or a diagram, it's impossible to give an exact measurement for the height of the highest point of the paving stone because it could be leaning at various angles against the wall.
Step-by-step explanation:
The question is asking for the height of the highest point of a rectangular paving stone resting against a vertical wall. The dimensions of the stone are 3m by 1m. To find this height, we would typically use principles from physics related to statics or geometry. However, without further details or a diagram, we cannot provide an exact answer because the stone could be leaning at various angles against the wall. Assuming the 3m side is vertical and the 1m side is on the ground, the highest point would be 3m. If the stone is leaning with the 1m side against the wall and the 3m side on the ground, the height would be less than 3m and would need trigonometry for an exact measurement.