Use 15 planks with the same specifications to form a cuboid with a volume of 3.6 cubic meters. The planks are 0.3 meters wide and 0.2 meters thick. Find the length of each plank.
用15根规格完全相同的木板堆成一个体积是3.6立方米的长方体，木板宽0.3米，厚0.2米，求每根木板的长．
<gadget id="calculator">3.6 / 0.3 / 0.2 / 15</gadget>
<output>4</output>

<result>4</result>