It took Xiaohong 10 minutes to go from home to school, and 8 minutes to return home from school along the original route. How much has the speed increased?
小红从家到学校用了10分钟，从学校沿原来返回家用了8分钟，速度提高了多少
<gadget id="calculator">1 / 8</gadget>
<output>1/8 = around 0.125</output>

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

<gadget id="calculator">(1/8) - (1/10)</gadget>
<output>1/40 = around 0.025</output>

<gadget id="calculator">(1/40) / (1/10)</gadget>
<output>1/4 = around 0.25</output>

<result>1/4 = around 0.25</result>