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.

Answer 1

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

Answer 2

Answer:

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

Step-by-step 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, $\frac{-45}{3}$ mile

$-15 mile$.