My brother goes to college, and he has to take a train for 6.4 hours. The average speed of the train is 70.5 km/h. How many kilometers did he travel by train?
哥哥上大学，要坐6.4个小时的火车，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 * 6.4</gadget>
<output>451.2</output>

<result>451.2</result>