There is a severe water shortage in the western region. Uncle Zhao, who lives in rural Gansu, decided to dig a 4-meter-long and 3-meter-wide water cellar to store rainwater for the convenience of water. To make this water cellar capable of storing 60 cubic meters of water, how deep should it be dug at least?
西部地区严重缺水，家住甘肃农村的赵叔叔为用水方便，决定挖一个长4米，宽3米的水窖储存雨水．要使这个水窖能储水60立方来，至少应挖多深？
<gadget id="calculator">4 * 3</gadget>
<output>12</output>

<gadget id="calculator">60 / 12</gadget>
<output>5</output>

<result>5</result>