The distance between A and B is 720 kilometers, and a car travels 640 kilometers in 8 hours. According to this calculation, how many hours will it take to complete the journey?
甲乙两地间的距离是720千米，一辆汽车8小时行驶了640千米．照这样计算，行完全程需要几小时？
<gadget id="calculator">640 / 8</gadget>
<output>80</output>

<gadget id="calculator">720 / 80</gadget>
<output>9</output>

<result>9</result>