The distance between A and B is 540 kilometers, and a passenger car and a truck are traveling towards each other from the two places at the same time. The passenger car travels 100 kilometers per hour, and the truck travels 80 kilometers per hour. After how many hours will the two vehicles meet? (solution in two ways)
甲、乙两地相距540千米，客车和货车同时分别从两地相向而行．客车每小时行100千米，货车每小时行80千米，经过几小时两车相遇？(用两种方法解)
<gadget id="calculator">100 + 80</gadget>
<output>180</output>

<gadget id="calculator">540 / 180</gadget>
<output>3</output>

<result>3</result>