The cross section of a canal is trapezoidal. The width of the canal bottom is 0.8 meters. When the water depth is 0.5 meters, the width of the water surface is 1.2 meters, and the water velocity is 0.6 meters per second. How many cubic meters of water can this canal flow per minute?
一条水渠的横截面是梯形，渠底宽为0.8米，当水深为0.5米时，水面宽为1.2米，水流速度是每秒0.6米，这条水渠每分钟能流水多少立方米？
<gadget id="calculator">0.8 + 1.2</gadget>
<output>2</output>

<gadget id="calculator">0.5 / 2</gadget>
<output>0.25</output>

<gadget id="calculator">2 * 0.25 * 0.6 * 60</gadget>
<output>18</output>

<result>18</result>