During May Day, Xiao Ming and his mother traveled to Wuyi Mountain. They got on the bus at 19:00 and arrived at 6:00 the next morning. How many hours did they spend on the road?
五一期间，小明和妈妈到武夷山旅游，她们19：00上车，第二天早上6：00到达，路上一共用了多少小时．
<gadget id="calculator">6 - 19</gadget>
<output>-13</output>

<gadget id="calculator">24 + (-13)</gadget>
<output>11</output>

<result>11</result>