Question

Starting at sea level, a submarine descended at a constant rate to a depth of −5/6 mile relative to sea level in 4 minutes.

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

Enter your answer in the box as a fraction in simplest form.

Answer 1

5/24 miles below sea level, or -5/24 miles relative to sea level

Explanation:

Since it descends at a constant rate, -5/6 miles for every 4 minutes means (-5/6)/4 every 1 minute, which is -5/24

Answer 2

Because it was a constant rate, divide the total distance by the total time:

-5/6 miles / 4 minutes = -5/6 x 1/4 = -(5 x 1)/(6 x 4) = -5/24 miles per minute

After the first minute is would be at -5/24 mile