Question

Starting at sea level, a submarine descended at a constant rate to a depth of −45 mile relative to sea level in 3 minutes.

What was the submarine's depth relative to sea level after the first minute?

Answer 1

-15 miles was the depth relative after the first minute.

Answer 2

the submarine's depth relative to sea level after first minute is -15 miles.

Explanation:

For 3 minutes, a submarine descended at a constant rate to a depth of -45 mile relative to sea level.

For first minute,

a submarine's depth relative to sea level is,
`(-45)/(3)` mile

`-15 mile`.