Last Wednesday, Dad took the T21 train from Beijing at 18:00 and arrived in Shanghai at 8:00 the next day. How many hours did Dad take the train from Beijing to Shanghai?
上星期三，爸爸乘座T21次列车18：00从北京出发，于第二天8：00正点到达上海，爸爸从北京到上海一共乘座了多少小时的火车．
<gadget id="calculator">6 + 8</gadget>
<output>14</output>

<result>14</result>