Question

The small submarine is at –1,320 feet in relation to sea level. The submarine needs to be at 180 feet below sea level in 60 minutes.

What does the average rate of ascent need to be?
A. 19 feet per minute
B. 18 feet per minute
C. 17 feet per minute
D. 16 feet per minute

Answer 1

Current depth: -1,320 ft
Needed depth: -180 ft

-1,320 - (-180) = - 1,140 ft

We need to climb at a rate of 1,140 feet per 60 minutes, or 19 feet per minute, to read 180 feet below sea level. Answer A is correct.

Answer 2

Option A - 19 feet per minute.

Explanation:

Given : The small submarine is at -1,320 feet in relation to sea level. The submarine needs to be at 180 feet below sea level in 60 minutes.

To find : What does the average rate of ascent need to be?

Solution :

The small submarine is at -1,320 feet in relation to sea level.

The submarine needs to be at 180 feet below sea.

The distance left below the sea level is

`1320-180=1140ft.`

The time taken to cover is 60 minutes.

The average rate of ascent need to be is total distance divided by time

`Rate={1140}{60}`

`Rate=19\text{ feet per minute}`

Therefore, Option A is correct.

The average rate of ascent need to be 19 feet per minute.