Question

Scientists on an oceanographic research vessel board a miniature submarine when it is at an elevation of 2 meters above the ocean's surface.

The ocean floor directly beneath the boat is at a depth of 180 meters.The submarine descends at a constant rate of 0.4 meters per second. How long, in seconds, could a scientist spend descending after boarding the submarine?

A.
x < 455
B.
x > 445
C.
x > 450
D.
x < 450