A train departs from Ganzhou at 8 o'clock on the first day and arrives in Beijing at 11 o'clock the next day. How many hours did the train travel in total?
一列火车第一天8时从赣州开出，第二天11时到达北京．这列火车一共行驶了多少小时？
<gadget id="calculator">24 + 3</gadget>
<output>27</output>

<result>27</result>