The submarine would be 1,620 ft if i’m understanding the question correctly
For this case we must find the value of the variable "p" of the following equation:

We apply distributive property on the left side of the equation taking into account that
and
:

We add similar terms:

We subtract
from both sides of the equation:

We subtract 8 from both sides of the equation:

We divide by -6 on both sides of the equation:

Answer:

The answer is for this is D.
6/(x-8)=2/(x+6)
times both sides by (x-8)(x+6)
6(x+6)=2(x-8)
distribute
6x+36=2x-16
minus 2x both sides
4x+36=-16
miinus 36 both sides
4x=-52
divide both sides by 4
x=-13