The distance between A and B is 280 kilometers, the car travels 70 kilometers per hour, and the motorcycle travels 40 kilometers per hour. How much time does it take to get from A to B by car rather than by motorcycle?
甲地与乙地相距280千米，汽车每小时行70千米，摩托车每小时行40千米．从甲地到乙地，乘汽车比乘摩托车省多长时间？
<gadget id="calculator">280 / 40</gadget>
<output>7</output>

<gadget id="calculator">280 / 70</gadget>
<output>4</output>

<gadget id="calculator">7 - 4</gadget>
<output>3</output>

<result>3</result>