A car departs from place A at 8:00 p.m. and arrives at place B at 7:00 a.m. the next day. How many hours has the car traveled in total?
一辆汽车从晚上8时从甲地出发，到第二天早上7时到达乙地，这辆汽车共行了多少小时．
<gadget id="calculator">12 - 8</gadget>
<output>4</output>

<gadget id="calculator">4 + 7</gadget>
<output>11</output>

<result>11</result>