Cut a cuboid with a length of 5cm, a width of 4cm and a height of 3cm into two cuboids, and the maximum surface area is increased by () square centimeters.

5×4×2=40 cm2

There are three cutting methods:1:4× 3 =12× 2 = 24;

2:5×3= 15×2=30

3:4×5=20×2=40。