Sorry for the delay, I've been sick in bed for a week . . .
Time refers to the total time spent spraying. As an example:
A particular nozzle sprays a footprint 0.5meters in width. The tractor (and thus the nozzle) moves at 3 meters/second. Thus, over a 5 second period, the area sprayed is...
This may be similar to an agricultural problem I've worked on.
The nozzles were rated based on a linear coverage at a certain distance (example, 0.5 meters at a nozzle distance of 1 meter). The area covered is then:
Linear Coverage * Nozzle Velocity * Time.
Dividing this by the volume of...