Xiaoming’s house is 320 kilometers away from his grandma’s house. He leaves home by car at 8:30 in the morning and travels 80 kilometers per hour. How long can he get to his grandma’s house?
小明家与姥姥家相距320千米，他早上8：30乘汽车从家出发，每小时行80千米，几小时能到姥姥家？
<gadget id="calculator">320 / 80</gadget>
<output>4</output>

<result>4</result>