The elevator at ground level is 0 feet. An elevator starts 120 feet below ground level. After traveling for 15 seconds, the elevator is 40 feet below ground level. Which statement describes the elevator's rate of change in elevation during this 15-second interval?

16/3 feet/second

Step-by-step explanation:

The elevator starts 120 feet below ground level and after 15 seconds the elevalor is at 40 feet below ground level.

The distance travelled in 15 seconds = 120-40=80 feet.

So, the change in elevation is 15 seconds is 80 feet.

As the rate of change of elevation is the chanve of elevation in unit time

=16/3 feet/second

=5.33 feet/ second