A section of the road, car A travels in 4 hours, and car B travels in 5 hours, then how much slower is the speed of car B than car A?
一段路，甲车4小时行完，乙车5小时行完，那么乙车的速度比甲车慢多少．
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">(1/4) - (1/5)</gadget>
<output>1/20 = around 0.05</output>

<gadget id="calculator">(1/20) / (1/4)</gadget>
<output>1/5 = around 0.2</output>

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