Answer: 0.4 meters per hour.
Explanation:
The rate of change of distance with respect to time is known as speed.
Formula :

Given : It's raining outside, and after 1 hour of rain, the water level in Jake's pond is 2 meters. After 3 hours, the water level is 2.8 meters.
i.e. Change in position= 2.8-2=0.8 meters
Change in time = 3-1=2 hours
i.e.

Hence, the rate of change =0.4 meters per hour.