2025 AMC 10B Problem 19

The container is a piece of a pyramid; the volume from the apex up to side length $w$ scales as $w^3$

Volumes split as $2^3 - 1^3 = 7$ (up to the midline, side $2$) and $3^3 - 2^3 = 19$ (remainder); scale the $35$ minutes

The container is a square frustum: a horizontal slice at height fraction $t$ has side $1 + 2t.$ Extend the sides up to their apex, and the volume out to where the side length is $w$ scales as $w^3.$ So the whole container is $3^3 - 1^3 = 26$ parts, the piece up to the midline (side $2$) is $2^3 - 1^3 = 7$ parts, and the rest is $3^3 - 2^3 = 19$ parts. Those $7$ parts take $35$ minutes, so each part is $5$ minutes. The remaining $19$ parts take $95$ minutes. Thus, D is the correct answer.