From station A to station B, car A takes 10 hours to travel, and car B takes 8 hours to travel. How much slower is the speed of car A than car B?
从A站到B站，甲车要行10小时，乙车要行8小时，甲车的速度比乙车慢多少．
<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>