The highway from a certain county to the provincial capital is 240 kilometers long, and the ordinary road is 300 kilometers long. A car travels at 80 km/h on a highway and at 50 km/h on an ordinary road. How much time do you save by taking the highway instead of the normal road?
某县城到省城的高速公路长240千米，普通公路长300千米．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50千米/时．走高速公路比普通公路节省多少时间？
<gadget id="calculator">300 / 50</gadget>
<output>6</output>

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

<gadget id="calculator">6 - 3</gadget>
<output>3</output>

<result>3</result>