The distance between A and B is 540 kilometers. A bus and a truck depart from A and B at the same time and meet each other after 3 hours. The bus travels 100 kilometers per hour. How many miles does the truck travel per hour?
甲、乙两地相距540千米，客车与货车同时从甲、乙两地相对开出，3小时后相遇，客车每小时行100千米．货车每小时行多少千米？
<gadget id="calculator">540 / 3</gadget>
<output>180</output>

<gadget id="calculator">180 - 100</gadget>
<output>80</output>

<result>80</result>