A cuboid glass container, measured from the inside, is 2dm in length and width. Pour 5L of water into the container, and then put a potato with a volume of about 0.2 cubic decimeters into the water. What is the depth of the water in the container?
一个长方体玻璃容器，从里面量长、宽均为2dm，向容器中倒入5L水，再把一个体积约是0.2立方分米的土豆放入水中，这是容器内的水深是多少？
<gadget id="calculator">5 + 0.2</gadget>
<output>5.2</output>

<gadget id="calculator">2 * 2</gadget>
<output>4</output>

<gadget id="calculator">5.2 / 4</gadget>
<output>1.3</output>

<result>1.3</result>