If A takes 20 minutes to cover 1 kilometer and B takes 25 minutes to cover 1 kilometer, how much faster is A than B?
甲走完1千米要20分钟，乙走完1千米要25分钟，则甲的速度比乙快多少
<gadget id="calculator">1 / 20</gadget>
<output>1/20 = around 0.05</output>

<gadget id="calculator">1 / 25</gadget>
<output>1/25 = around 0.04</output>

<gadget id="calculator">(1/20) - (1/25)</gadget>
<output>1/100 = around 0.01</output>

<gadget id="calculator">(1/100) / (1/25)</gadget>
<output>1/4 = around 0.25</output>

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