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Airplane A takes off and ascends at a rate of 3000 ft/min. At the same time, Airplane B, which is flying at 30,000 ft, begins to descend at a rate of 2500 ft/min.

Let h represent the height off the ground in feet, and let t represent time in minutes.

Which system models this situation?

A.
h = 3000t
h = 2500 + 30,000t

B.
h = 30,000 + 3000t
h = 30,000 − 3000t

C.
h = 2500t
h = 30,000 − 3000t

D.
h = 3000t
h = 30,000 − 2500t