Dad is on a business trip and has to take a train for 6 hours. The average speed of the train is 70.5 kilometers per hour. How many kilometers did he travel by train?
爸爸出差，要坐6小时的火车，火车的平均速度是70.5千米∕时，他坐火车走了多少千米？
<gadget id="calculator">70.5 * 6</gadget>
<output>423</output>

<result>423</result>