A 5-meter-long cuboid is cut into 6 sections, and the surface area increases by 7.2 square meters. What is the volume of the original cuboid in cubic meters?
一根长5米的长方体木料，截成6段后，表面积增加了7.2平方米，原来长方体的体积是多少立方米．
<gadget id="calculator">7.2 / 10</gadget>
<output>0.72</output>

<gadget id="calculator">0.72 * 5</gadget>
<output>3.6</output>

<result>3.6</result>