The school bunker has a volume of 22.4 cubic meters, a length of 7 meters and a width of 4 meters. How deep is this bunker?
学校沙坑容积是22.4立方米，长7米，宽4米，这个沙坑有多深？
<gadget id="calculator">4 * 7</gadget>
<output>28</output>

<gadget id="calculator">22.4 / 28</gadget>
<output>0.8</output>

<result>0.8</result>