If a car travels from A to B, it takes 8 hours to go and 10 hours to return. The return speed is equal to the speed when going
一辆汽车从甲地到乙地，去时用8小时，返回时用10小时，返回的速度相当于去时的多少
<gadget id="calculator">1 / 10</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">1 / 8</gadget>
<output>1/8 = around 0.125</output>

<gadget id="calculator">(1/10) / (1/8)</gadget>
<output>4/5 = around 0.8</output>

<result>4/5 = around 0.8</result>