A train departs from station A to station B at 8 am, and arrives at station B at 7 am the next day. How many hours has the train traveled in total?
一列火车上午8时从甲站开往乙站，到第二天上午7时到达乙站，火车途中一共行了多少小时．
<gadget id="calculator">16 + 7</gadget>
<output>23</output>

<result>23</result>