Xiaoguo has to walk 1.5 kilometers from home to school. After walking 0.4 kilometers, he went home to pick up a book. So how many kilometers did he actually walk from home to school?
小果从家到学校要走1.5千米，他走了0.4千米后又回家取了一本书．这样他从家到学校实际走了多少千米？
<gadget id="calculator">0.4 * 2</gadget>
<output>0.8</output>

<gadget id="calculator">0.8 + 1.5</gadget>
<output>2.3</output>

<result>2.3</result>