Final answer:
Darrell walks at a unit rate of 1.5 meters per second or 90 meters per minute, calculated by dividing the distance by the time.
Step-by-step explanation:
In 60 seconds, Darrell walks 90 meters. To describe the unit rate at which Darrell walks, we calculate the speed by dividing the distance by the time. This gives us a unit rate of:
Speed = Distance / Time = 90 meters / 60 seconds = 1.5 meters per second.
The two descriptions of the unit rate at which he walks could be:
- 1.5 meters per second
- 90 meters per minute (since there are 60 seconds in a minute)