A submarine is floating 50 m below sea level.

(i) It goes down a further 380 m to a point A. Write down the depth of point A below sea level.

(ii) From point A, it rises 120 m to another point B. What is the depth of point B below sea level?



Answer :

Certainly! Let's solve this problem step by step.

Initial Depth:
1. The submarine starts 50 meters below sea level.

(i) Depth of Point A:
1. From its current position, the submarine goes down an additional 380 meters.
2. To find the depth of point A below sea level, we add the distance it descends to its initial depth.
- Initial depth: 50 meters below sea level
- Additional depth: 380 meters
- Total depth at point A = 50 meters + 380 meters = 430 meters

So, the depth of point A below sea level is 430 meters.

(ii) Depth of Point B:
1. From point A, the submarine rises 120 meters.
2. To find the depth of point B below sea level, we subtract the distance it ascends from the depth of point A.
- Depth at point A: 430 meters below sea level
- Ascent: 120 meters
- Total depth at point B = 430 meters - 120 meters = 310 meters

So, the depth of point B below sea level is 310 meters.

In summary:
(i) The depth of point A below sea level is 430 meters.
(ii) The depth of point B below sea level is 310 meters.