# A submarine is patrolling the ocean. Each hour, it descends 25 feet and then ascends 10 feet. At...

## Question:

A submarine is patrolling the ocean. Each hour, it descends 25 feet and then ascends 10 feet. At 7:00 AM, it is at a depth of 100 feet. What will its depth be at 11:00 AM?

## Distance:

Distance is defined as how far an object has traveled. It is a scalar quantity thus, it only has magnitude. When the distance is divided by the time of travel, it becomes speed.

The total hours that it moves is 4 hours. Within this span of time it ascends twice and descends twice. Calculating the depth, we write:

{eq}h = 100 - 50 + 20 \\ h = 70 \ ft {/eq}