Uncle Wang inserted a 4.2-meter-long bamboo pole into the pond. The part of the bamboo pole in the mud is 0.6 meters, and the part above the water is 0.4 meters. How deep is the water?
王伯伯把一根长4.2米的竹竿插入池塘中，竹竿入泥部分是0.6米，露出水面的部分是0.4米，水深多少米？
<gadget id="calculator">4.2 - 0.6 - 0.4</gadget>
<output>3.2</output>

<result>3.2</result>