The length of the road from A to B is 240 km. A car travels at 80 km/h on a highway and at 60 km/h on an ordinary road. How much time does it take to travel from A to B on a highway compared to a normal road?
甲地到乙地的公路长240千米．一辆汽车走高速路的速度是80千米/时，走普通公路的速度是60千米/时．从甲地去乙地走高速路比普通公路节省多长时间？
<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>