There is a cylindrical cistern, which can store 753.6 cubic meters of water. If it is dug 1.5 meters deeper, it can store 1224.6 cubic meters of water. How deep is this cistern?
有一个圆柱形蓄水池，能蓄水753.6立方米，现再挖深1.5米，则可蓄水1224.6立方米，原来这个蓄水池深多少米？
<gadget id="calculator">1_224.6 - 753.6</gadget>
<output>471</output>

<gadget id="calculator">471 / 1.5</gadget>
<output>314</output>

<gadget id="calculator">753.6 / 314</gadget>
<output>2.4</output>

<result>2.4</result>