Final answer:
It will take 59 minutes for the submarine to reach a depth of 325 feet below the surface, starting from 30 feet below and descending at a rate of 5 feet per minute.
Step-by-step explanation:
The student is asking how long it will take for a submarine to reach a depth of 325 feet below the surface if it descends at a rate of 5 feet per minute and is already 30 feet below the surface.
First, we determine the additional depth the submarine must cover: 325 feet - 30 feet = 295 feet. Next, we calculate the number of minutes required to descend 295 feet at a rate of 5 feet per minute: 295 feet ÷ 5 feet/minute = 59 minutes.
Therefore, it will take 59 minutes for the submarine to reach a depth of 325 feet below the surface.