At 12:00 noon, Xiaoyue went to find Teacher Liu from Jiayi School. At the same time, Teacher Liu also set off from school to Xiaoyue's home. The point where the two first met was 2 kilometers away from Xiaoyue's home, but they did not see each other. Going forward, the teacher went to Xiaoyue's house, and Xiaoyue turned around and returned immediately after arriving at the school. When the two met face to face for the second time, they were 4 kilometers away from Xiaoyue's house. How many kilometers away is Xiaoyue's house from the school?
小悦中午12点从家一学校找刘老师，与此同时，刘老师也从学校出发前往小悦家，两人第一次迎面相遇点离小悦家2千米，但互相没有看见，继续前行，老师到小悦家、小悦到学校后都立刻掉头返回，两人第二次迎面相遇时离小悦家4千米，请问小悦家离学校多少千米？
<gadget id="calculator">2 * 2</gadget>
<output>4</output>

<gadget id="calculator">2 + 4 + 4</gadget>
<output>10</output>

<gadget id="calculator">10 / 2</gadget>
<output>5</output>

<result>5</result>