A car travels from A to B. It takes 8 hours to go and 10 hours to return. How much slower is it when returning than when going?
一辆汽车从甲地到乙地，去时用8小时，返回用10小时，返回时比去时慢多少
<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) / (1/8)</gadget>
<output>1/5 = around 0.2</output>

<result>1/5 = around 0.2</result>