Xiaohong practiced running, first ran (3/10) kilometers, and then ran (1/10) kilometers, how many kilometers did she run in total?
小红练习跑步，先跑了(3/10)千米，又跑了(1/10)千米，她一共跑了多少千米？
<gadget id="calculator">3 / 10</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">1 / 10</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">(3/10) + (1/10)</gadget>
<output>2/5 = around 0.4</output>

<result>2/5 = around 0.4</result>