cylindrical iron block with a base diameter of 10 decimeters and a height of 5 decimeters and a conical iron block with a base radius of 4 meters and a height of 3 meters are melted and cast into a piece of iron with a length of 15 decimeters and a width of 10 decimeters A rectangular parallelepiped iron bar, how many decimeters is the height of this iron bar?
将一块底面直径为10分米，高为5分米的圆柱形铁块和一块底面半径为4米，高为3米的圆锥形铁块熔铸成一块长为15分米，宽为10分米的长方体铁条，这块铁条的高为多少分米？
<gadget id="calculator">10 / 2</gadget>
<output>5</output>

<gadget id="calculator">5 ** 2</gadget>
<output>25</output>

<gadget id="calculator">3.14 * 25 * 5</gadget>
<output>392.5</output>

<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">4 ** 2</gadget>
<output>16</output>

<gadget id="calculator">(1/3) * 3.14 * 16 * 3</gadget>
<output>50.24</output>

<gadget id="calculator">392.5 + 50.24</gadget>
<output>442.74</output>

<gadget id="calculator">15 * 10</gadget>
<output>150</output>

<gadget id="calculator">442.74 / 150</gadget>
<output>2.9516</output>

<result>2.9516</result>