Explanation:
the volume of the cube at the beginning is
edge³ = 16³ = 4096 cm³
after 1 minute it is 4101 cm³
that means the edge is then
cubic root(4101) = 16.00650777... cm
the surface area of a cube is
6×edge²
at the beginning it was
6×16² = 1536 cm²
after 1 minute (and the increased volume) it is
6×16.00650777...² = 1,537.249746... cm²
at that moment the surface area is increasing at
1.249745825... cm²/ minute