How many square centimeters does the surface area of the block increase when a rectangular block of wood with a length of 40 cm, a width of 15 cm, and a height of 10 cm is divided into three equal parts along the horizontal direction?
把一个横放着的长40厘米、宽15厘米、高10厘米的长方体木块沿水平方向平均分成三块后，木块的表面积增加了多少平方厘米？
<gadget id="calculator">40 * 15 * 4</gadget>
<output>2_400</output>

<result>2_400</result>