The distance between A and B is 675 kilometers. A car starts from A to B and travels 315 kilometers in 7 hours. According to this calculation, how many hours will it take to reach B?
AB两地相距675千米，一辆汽车从A地出发开往B地，7小时行了315千米，照这样计算，还要行多少小时才能到达B地？
<gadget id="calculator">315 / 7</gadget>
<output>45</output>

<gadget id="calculator">675 / 45</gadget>
<output>15</output>

<gadget id="calculator">15 - 7</gadget>
<output>8</output>

<result>8</result>