A highway is 720 kilometers long, and a car travels 300 kilometers in 5 hours. How many hours will it take to travel at this speed? (Answer with the knowledge of proportion)
一条公路全长720千米，一辆汽车5小时行了300千米，照这样的速度行驶，行完全程共需要几小时？(用比例的知识解答)
<gadget id="calculator">300 / 5</gadget>
<output>60</output>

<gadget id="calculator">720 / 60</gadget>
<output>12</output>

<result>12</result>