A and B start from opposite places at the same time and meet at a distance of 7 kilometers from the midpoint. What is the distance in kilometers between them?
甲、乙两人同时从两地相对出发，在离中点7千米处相遇，这时他们所走路程相差多少千米
<gadget id="calculator">7 + 7</gadget>
<output>14</output>

<result>14</result>