The distance between A and B is 720 kilometers, and two cars start from opposite sides of the two places. The passenger car travels 40 kilometers per hour, and the truck travels 32 kilometers per hour. After how many hours will the two vehicles meet?
甲乙两地相距720千米，两辆汽车分别从两地相向出发．客车每小时行40千米，货车每小时行32千米，经过几小时两车相遇？
<gadget id="calculator">40 + 32</gadget>
<output>72</output>

<gadget id="calculator">720 / 72</gadget>
<output>10</output>

<result>10</result>