When the students walked 80% of the way from school to the park, they just arrived at the Children's Palace; when they returned along the original road, they walked a quarter of the way and passed the Children's Palace for 0.3 kilometers. How many kilometers away is the school from the park?
同学们从学校去公园，走了全程的百分之八十时，正好到达少年宫；沿原路返回时行了全程的四分之一就过了少年宫0.3千米，学校离公园多少千米？
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">80 / 100</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">1 - (4/5)</gadget>
<output>1/5 = around 0.2</output>

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

<gadget id="calculator">0.3 / (1/20)</gadget>
<output>6</output>

<result>6</result>