The radius of the driving wheel of a train is 0.75 meters. If it rotates 400 times per minute, how many meters can the train advance per hour?
一列火车的主动轮半径是0.75米，如果每分钟转动400圈，这列火车每小时可以前进多少米？
<gadget id="calculator">2 * 3.14 * 0.75 * 400 * 60</gadget>
<output>113_040</output>

<result>113_040</result>