The expressway from Yanhe to Guiyang has a total length of 360 kilometers. A truck starts from Yanhe and travels 120 kilometers in 3 hours. According to this calculation, how many hours does it take for this car to reach Guiyang? (Solve with ratio)
沿河到贵阳高速全长360千米，一辆货车从沿河出发，3小时行了120千米，照这样计算，这辆汽车到达贵阳需要多少小时？(用比例解)
<gadget id="calculator">120 / 3</gadget>
<output>40</output>

<gadget id="calculator">360 / 40</gadget>
<output>9</output>

<result>9</result>