Final answer:
The submarine will take approximately 54 minutes to reach 250 m below sea level.
Step-by-step explanation:
To find the time it takes for the submarine to reach 250 m below sea level, we can use the formula:
Time = Distance / Speed
The distance the submarine needs to travel is 20 m (20 m above sea level) + 250 m (250 m below sea level), which is 270 m.
Given that the submarine submerges at a rate of 5 m/min, we can calculate:
Time = 270 m / 5 m/min = 54 min
Therefore, it will take the submarine approximately 54 minutes to reach 250 m below sea level.
Learn more about submarine descent