A train has 20 cars of the same volume, each car is 13 meters long from the inside, 2.5 meters wide, and the height of the coal is 1.2 meters. How many cubic meters of coal does this train carry each time? (Complete independently: find the volume first, and then find 20 such volumes.)
一列火车有容积相同的车厢20节，每节车厢从里面量长13米，宽2.5米，装煤的高度是1.2米．这列火车每次运煤多少立方米？(独立完成：先求体积，再求20个这样的体积．)
<gadget id="calculator">13 * 2.5 * 1.2 * 20</gadget>
<output>780</output>

<result>780</result>