Which statement best defines the two quantities that are measured to find the rate at which an airplane descends?

The quantity of time measured in minutes depends on the quantity of speed measured in feet.

The quantity of speed measured in feet depends on the quantity of time measured in minutes.

Speed is not measured in feet!    So it is not either of those 2.  

 

The quantity of distance measured in feet depends on the quantity of time measured in minutes.

The quantity of time measured in minutes depends on the quantity of distance measured in feet.

Now this is strange wording but the distance the plane travels depends on how many minutes have passed.

Plus speed = distance / time 

So I would go for the 2nd last one.