A train departs at 17:00 and arrives at the destination at 6:00 the next morning. How many hours has it traveled in total?
一列火车17时发车，第二天早晨6时到达目的地，它共行驶了多少小时．
<gadget id="calculator">24 - 17</gadget>
<output>7</output>

<gadget id="calculator">7 + 6</gadget>
<output>13</output>

<result>13</result>