Answer:
-12 ft/min
Explanation:
We are given that scuba diver descends 48 feet in 4 min.
We have to find the average change of divers in position per min.
Total distance covered by diver=-48 feet
Time taken by diver=4 min
Average change=
ft/min

The diver descend 12 feet in one minute.
Where negative sign shows that diver going to downward.
Answer:-12 ft/min