From A to B, car A can arrive at 4 o'clock, and car B can arrive at 5 o'clock. How much faster is car A than car B?
从A地到B地，甲车4时可以到达，乙车5时可以到达，甲车速度比乙车快几分之几？
<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) / (1/5)</gadget>
<output>1/4 = around 0.25</output>

<result>1/4 = around 0.25</result>