A bamboo pole is inserted into the water. The part above the water is 1.5 meters, which is 40% shorter than the part in the water. How long is the bamboo pole?
一根竹竿插入水中，露出水面的部分是1.5米，比水中的部分短40%，这根竹竿有多长？
<gadget id="calculator">40 / 100</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1 - (2/5)</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">1.5 / (3/5)</gadget>
<output>2.5</output>

<gadget id="calculator">2.5 + 1.5</gadget>
<output>4</output>

<result>4</result>