A train from A to B departs at 8:00 a.m. and arrives at 12:00 a.m., traveling an average of 135 kilometers per hour. How many kilometers is the distance between A and B?
一列火车从甲地到乙地，上午8时出发，12时到达，平均每小时行135千米，甲、乙两地相距多少千米？
<gadget id="calculator">12 - 8</gadget>
<output>4</output>

<gadget id="calculator">135 * 4</gadget>
<output>540</output>

<result>540</result>