Uncle Wang has to transport 48 trucks of bricks, and 12 trucks have already been transported. If he transports 3 trucks per hour, how many hours will it take to finish?
王叔叔要运48车砖，已经运走了12车，如果每小时运3车，还要几小时才能运完？
<gadget id="calculator">48 - 12</gadget>
<output>36</output>

<gadget id="calculator">36 / 3</gadget>
<output>12</output>

<result>12</result>