There is a cylindrical pool. A 5-meter-long bamboo stalk is inserted vertically into the water. Mark the junction between the bamboo stalk and the water surface, then take it out and turn the bamboo stalk upside down. Do it again according to the above method, and it turns out that the section between the two marks does not enter the water, and accounts for (1/5) of the entire bamboo pole. How many meters is the water depth of the pool?
有一个圆柱形水池，用一根长5米的竹秆竖直地插入水中，在竹竿与水面交接处注上记号，然后取出并将竹竿倒过来．按照上面的方法再做一次，结果发现两个记号间的那段没有进入水中，并占整个竹竿的(1/5)，那么水池的水深多少米？
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">5 * (1/5)</gadget>
<output>1</output>

<gadget id="calculator">5 - 1</gadget>
<output>4</output>

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

<result>2</result>