Answer: The depth is 12m
Explanation:
The area is 350m^2
And the depth in each point of the base is at the same depth D.
Then we have a cuboid.
Now, the volume of a cuboid is equal to:
V= L*W*D
L = lenght, W = width and D = depth.
Such that L*W = area = 350m^2
then we have:
V = D*350m^2
Now we want V = 4200m^3
4200m^3 = D*350m^2
D = (4200/350) m = 12m
The depth is 12m