A ship from Qingdao to Shanghai travels 12.5 kilometers per hour and arrives in 24 hours. How many hours will it take to travel 15 kilometers per hour?
一艘轮船从青岛到上海，每小时行12.5千米，24小时到达．如果每小时行15千米，需要多少小时到达？
<gadget id="calculator">12.5 * 24</gadget>
<output>300</output>

<gadget id="calculator">300 / 15</gadget>
<output>20</output>

<result>20</result>