Final answer:
The change in elevation of the hot air balloon is 40 meters per minute, calculated by dividing the total descent of 360 meters by the nine minutes it took to descend.
Step-by-step explanation:
Rate of Descent for a Hot Air Balloon
To find the change in elevation of the hot air balloon per minute, we can use the formula:
Rate of descent
= Total descent distance / Total time taken
The balloon descends 360 meters in nine minutes. Using the formula, we get:
Rate of descent = 360 meters / 9 minutes = 40 meters per minute
Therefore, the change in elevation of the hot air balloon is 40 meters per minute.