A cuboid fish tank is 30 centimeters long and 20 centimeters wide. After pouring 4.5 liters of water, it just takes up half of the volume of the fish tank. How many meters is the height of the fish tank?
长方体鱼缸，长30厘米，宽20厘米，倒进4.5升水后，正好占鱼缸容积的一半，这个鱼缸的高约为多少米？
<gadget id="calculator">30 * 20</gadget>
<output>600</output>

<gadget id="calculator">1_000 / 600 / 100</gadget>
<output>1/60 = around 0.016667</output>

<gadget id="calculator">4.5 * 2 * (1/60)</gadget>
<output>0.15</output>

<result>0.15</result>