Put a bamboo pole vertically into the water, the wetted part is 2.8 meters, and the part exposed to the water is 0.4 meters longer than the wetted part. How long is the bamboo pole?
把一根竹竿垂直放入水中，浸湿部分是2.8米，露出水面部分比浸湿部分多0.4米．竹竿有多长？
<gadget id="calculator">2.8 + 0.4 + 2.8</gadget>
<output>6</output>

<result>6</result>