There are two aircraft.
One burns two tonnes per hour and has a ground speed of 250 knots.
One burns four tonnes per hour and has a ground speed of 750 knots.
What is the diffenerce in their fuel consumption over a 1000NM sector?
2,67 ton fuel
pr. 1000 NM sector.
Is the answer a rate, or a mass?
A rate
pr. 1000 Nm, you set the premise in the question. Since we both know that it's over a 1000 Nm sector, I wouldn't have to mention it in my answer in colloquial language, but the underlying premise is still
pr. 1000 Nm.
Let's define
rate as well:
In mathematics, a rate is a ratio between two measurements, often with different units. However, a rate of change can be specified per unit time, or per unit of length or mass or another quantity.