The distance from Xiaoying’s home to school is 1.2 kilometers. One day Xiaoying set off from home to school. When she walked a kilometer away, she found that she forgot to take the dictionary, so she immediately turned around and went home to get the dictionary before going to school. How many kilometers did you walk from home to school?
小英家到学校的距离是1.2千米，一天小英从家出发去学校，当走到a千米时发现忘记拿字典，于是立即转身回家拿上字典再去学校，小英这次从家去学校共走了多少千米．
<gadget id="calculator">1.2 + 2</gadget>
<output>3.2</output>

<result>3.2</result>