The speed of a car is 68 kilometers per hour. According to this speed, the expressway from Shanghai to Nanjing is 272 kilometers long. How many hours does it take for this car to travel?
一辆汽车的速度是68千米/时，照这样的速度计算，从上海到南京的高速公路全长272千米，这辆汽车需行几小时？
<gadget id="calculator">272 / 68</gadget>
<output>4</output>

<result>4</result>