A cuboid pool is 40 cm long, 20 cm wide, 15 cm high, and the depth of water in the pool is 12 cm. Put a cylindrical part with a bottom area of 90 cm2, and the water in the pool overflows by 300 ml. How many centimeters is the length of the cylindrical part? (1 ml = 1 cubic centimeter)
一个长方体水池长40厘米，宽20厘米，高15厘米，池内水深12厘米，放入一个底面积为90平方厘米的圆柱形零件，池中的水溢出300毫升，圆柱形零件长多少厘米？(1毫升=1立方厘米)
<gadget id="calculator">15 - 12</gadget>
<output>3</output>

<gadget id="calculator">40 * 20 * 3</gadget>
<output>2_400</output>

<gadget id="calculator">2_400 + 300</gadget>
<output>2_700</output>

<gadget id="calculator">2_700 / 90</gadget>
<output>30</output>

<result>30</result>