Answer:
The average rate of climb in miles per minute is 8.2x10⁻⁴ miles/min.
Step-by-step explanation:
The average rate can be calculated as follows:

Where:
: is the initial height = 24976 ft
: is the final height = 29035 ft
: is the initial time = 0
: is the final time = 15 hr, 35 min = 935 min
Then, the average rate of climb in miles per minute is:

Therefore, the average rate of climb in miles per minute is 8.2x10⁻⁴ miles/min.
I hope it helps you!