The train travels 108 kilometers per hour, and the speed of the plane is 6 times that of the train. How many kilometers per hour is the train slower than the plane?
火车每小时行驶108千米，飞机的速度是火车的6倍．火车每小时比飞机慢多少千米？
<gadget id="calculator">6 * 108</gadget>
<output>648</output>

<gadget id="calculator">648 - 108</gadget>
<output>540</output>

<result>540</result>