Answer:
Essence is 140 flyers per hour
Raizon is 80 flyers per hour
Explanation:
In essence (if you see what I did there) a unit rate (strictly in this context) is how much work is done for 1 hour of time. To find this, we simply divide the number of flyers by the number of hours of worked.
So, for Essence:

The units for this problem will be flyers per hour. So, Essence has a unit rate of 140 flyers per hour.
For Raizon:

Raizon has a unit rate of 80 flyers per hour.