Lele walked from place A to place B. In the first hour, he walked the whole distance (1/4), and in the second hour, he walked 20% of the whole journey. At this time, he was still 2 kilometers away from the midpoint of the two places. How many kilometers apart?
乐乐从甲地步行去乙地，第1小时行了全程的(1/4)，第二小时行了全程的20%，这时离两地的中点还有2千米，甲乙两地相距多少千米？
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">(1/2) - (1/4) - (1/5)</gadget>
<output>1/20 = around 0.05</output>

<gadget id="calculator">2 / (1/20)</gadget>
<output>40</output>

<result>40</result>