The distance between A and B is 640 km. If a car travels from A to B at 80 km per hour, how many hours can it be reached?
A、B两地相距640千米，一辆汽车从A开往B，每小时行80km，多少小时可以达到．
<gadget id="calculator">640 / 80</gadget>
<output>8</output>

<result>8</result>