The distance from Fenghuang Mountain to Qingshan Karst Cave is 240 kilometers, the bus travels 60 kilometers per hour, and the car travels 80 kilometers per hour. Two cars drive from Fenghuang Mountain to Qingshan Karst Cave at the same time. How many hours earlier will the car arrive than the bus?
凤凰山到青山溶洞的距离是240千米，大客车每小时行60千米，小轿车每小时行80千米．两车同时从凤凰山开往青山溶洞，小轿车比大客车提前几小时到达？
<gadget id="calculator">240 / 60</gadget>
<output>4</output>

<gadget id="calculator">240 / 80</gadget>
<output>3</output>

<gadget id="calculator">4 - 3</gadget>
<output>1</output>

<result>1</result>