Final answer:
The vertical distance between the plane flying at 5000 m above sea level and the submarine floating 1200 m below sea level is 6200 meters.
Step-by-step explanation:
The student is asking about the vertical distance between two points: one above sea level (a plane at 5000 m) and one below sea level (a submarine at -1200 m). To find this distance, we need to consider the absolute values of these altitudes and add them together. The plane is 5000 meters above sea level, and the submarine is 1200 meters below, so the total vertical distance between them is 5000 m + 1200 m = 6200 m.