A cuboid stone with a length of 15 decimeters has a cross-section of a square with a side length of 0.6 decimeters. If the weight of a stone per cubic decimeter is 3.1 kilograms, what is the mass of the stone in kilograms?
一根长方体石料，长15分米，横截面是一个边长为0.6分米的正方形．如果每立方分米石料的重量是3.1千克，那么这根石料的质量是多少千克？
<gadget id="calculator">0.6 * 0.6 * 15 * 3.1</gadget>
<output>16.74</output>

<result>16.74</result>