Answer:
Her speed is of 2 miles per hour.
Explanation:
Velocity:
The velocity is given by the following formula:

In which v is the velocity, d is the distance and t is the time.
2/3 mile in 1/3 hour .
This means that

Which unit rate describes antoinettes speed in miles per hour?
This is v. So

Her speed is of 2 miles per hour.