A container with a side length of 4 meters is filled with sand. If the sand is spread on a road with a length of 128 meters and a width of 5 meters, how thick can it be?
棱长是4米的容器里装满了沙子，把这些沙子铺在一条长128米、宽5米的公路上，可以铺多厚？
<gadget id="calculator">128 * 5</gadget>
<output>640</output>

<gadget id="calculator">4 / 640</gadget>
<output>1/160 = around 0.00625</output>

<gadget id="calculator">4 * 4 * (1/160)</gadget>
<output>1/10 = around 0.1</output>

<result>1/10 = around 0.1</result>