A cuboid glass tank is 60 cm long and 40 cm wide when measured from the inside, and the water depth in the tank is 16 cm. After a stone is immersed in water, the water level rises to 19 cm, find the volume of the stone.
一个长方体玻璃缸，从里面量长60厘米，宽40厘米，缸内水深16厘米．把一块石头浸入水中后，水面升到19厘米，求石块的体积．
<gadget id="calculator">19 - 16</gadget>
<output>3</output>

<gadget id="calculator">60 * 40 * 3</gadget>
<output>7_200</output>

<result>7_200</result>