The distance from Huanhuan’s home to school is 0.6 kilometers. One day, Huanhuan went to school from home to school. When he walked a kilometer, he found that he forgot to take his Chinese books, so he immediately turned back and went home to take the Chinese books to school. Huanhuan How many kilometers did you walk from home to school?
欢欢家到学校的距离是0.6千米，一天欢欢上学从家出发去学校，当走了a千米时发现忘记拿语文书，于是立即转身回家拿上语文书去学校，欢欢这次从家去学校共走了多少千米．
<gadget id="calculator">0.6 + 2</gadget>
<output>2.6</output>

<result>2.6</result>