A conical sand pile has a base diameter of 5 meters and a height of 0.9 meters. Use this pile of sand to spread on the long jump field with a length of 10 meters and a width of 2.5 meters. How thick can it be?
一个圆锥形沙堆，底面直径是5米，高是0.9米．用这堆沙铺在长10米，宽2.5米的跳远场地．能铺多厚呢？
<gadget id="calculator">5 / 2</gadget>
<output>5/2 = around 2.5</output>

<gadget id="calculator">(5/2) ** 2</gadget>
<output>25/4 = around 6.25</output>

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

<gadget id="calculator">10 * 2.5</gadget>
<output>25</output>

<gadget id="calculator">(1/3) / 25</gadget>
<output>1/75 = around 0.013333</output>

<gadget id="calculator">3.14 * (25/4) * 0.9 * (1/75)</gadget>
<output>0.2355</output>

<result>0.2355</result>