Car A takes 8 hours to travel a section of the road, and car B takes 10 hours to travel. How much slower is B's speed than A's speed?
一段路甲车需8小时行完，乙车需10小时行完，乙速比甲速慢多少．
<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>