The highway from Wenling to Ningbo is 270 kilometers long. The speed of a car on the high-speed road is 90 kilometers per hour, and the speed on the ordinary road is 30 kilometers per hour. How much will it save if you take the high-speed road from Wenling to Ningbo instead of taking the ordinary road? time?
温岭到宁波的公路长270千米，一辆汽车走高速的速度是90千米/小时，走普通公路的速度是30千米/小时，从温岭到宁波如果走高速比走普通公路要节省多少时间？
<gadget id="calculator">270 / 30</gadget>
<output>9</output>

<gadget id="calculator">270 / 90</gadget>
<output>3</output>

<gadget id="calculator">9 - 3</gadget>
<output>6</output>

<result>6</result>