The road between A and B is 392 kilometers long. A car starts from A to B and travels 112 kilometers in the first 2 hours. At this speed, how many hours will it take to reach B? (Solve with ratio)
甲、乙两地公路长392千米，一辆汽车从甲地出发开往乙地，前2小时行了112千米，照这样的速度，还要几小时才能到达乙地？(用比例解)
<gadget id="calculator">392 - 112</gadget>
<output>280</output>

<gadget id="calculator">112 / 2</gadget>
<output>56</output>

<gadget id="calculator">280 / 56</gadget>
<output>5</output>

<result>5</result>