Two people, A and B, walk towards each other from east to west. A travels 6 kilometers per hour, and B travels 5 kilometers per hour. After 2 hours, the distance between the two is still 4 kilometers. How far is the distance between the two places?
甲乙两人从东西两地相对而行，甲每小时行6千米，乙每小时行5千米，2小时后两人还相距4千米，两地有多远？
<gadget id="calculator">6 + 5</gadget>
<output>11</output>

<gadget id="calculator">11 * 2</gadget>
<output>22</output>

<gadget id="calculator">22 - 4</gadget>
<output>18</output>

<result>18</result>