The express train and the slow train depart from places A and B respectively at the same time, go towards each other, and meet each other after 5 hours. It is known that the slow train takes 12.5 hours to go from point B to point A, the slow train stays at point A for half an hour and then returns, and the express train stops at point B for 1 hour and then returns, so how long does it take for the two cars to meet from the first encounter to the second encounter ?
快车与慢车分别从甲、乙两地同时开出，相向而行，经过5小时相遇．已知慢车从乙地到甲地用12.5小时，慢车到甲地停留半小时后返回，快车到乙地停留1小时后返回，那么两车从第一次相遇到第二次相遇共需多少时间？
<gadget id="calculator">12.5 + 0.5</gadget>
<output>13</output>

<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 / 12.5</gadget>
<output>0.08</output>

<gadget id="calculator">(1/5) - 0.08</gadget>
<output>0.12</output>

<gadget id="calculator">0.5 - 1</gadget>
<output>-0.5</output>

<gadget id="calculator">12.5 + (-0.5)</gadget>
<output>12</output>

<gadget id="calculator">0.12 * 12</gadget>
<output>1.44</output>

<gadget id="calculator">2 - 1.44</gadget>
<output>0.56</output>

<gadget id="calculator">0.56 / (1/5)</gadget>
<output>2.8</output>

<gadget id="calculator">2.8 - 5</gadget>
<output>-2.2</output>

<gadget id="calculator">13 + (-2.2)</gadget>
<output>10.8</output>

<result>10.8</result>