The distance between Port A and Port B is 252 kilometers. A ship departs from Port A to Port B and travels 54 kilometers in 3 hours. At this speed, how many hours will it take to reach Port B? (Solve with ratio)
甲港与乙港相距252千米，一艘轮船从甲港出发开往乙港，3小时行了54千米．照这样的速度，到达乙港还需多少小时？(用比例解)
<gadget id="calculator">252 - 54</gadget>
<output>198</output>

<gadget id="calculator">54 / 3</gadget>
<output>18</output>

<gadget id="calculator">198 / 18</gadget>
<output>11</output>

<result>11</result>