Saw a cuboid with 48 square cm cross section and 3M long into three sections, how many square cm has the surface area increased?

Saw a cuboid with 48 square cm cross section and 3M long into three sections, how many square cm has the surface area increased?

When sawing into 3 sections, the number of additional cross sections is
(3-1) × 2 = 4
The surface area has increased
48 × 4 = 192 square centimeter