From school to the bookstore, it took Xiao Ming 4 minutes and Xiao Hua 5 minutes. How much faster is Xiao Ming than Xiao Hua?
从学校到书店，小明用了4分钟，小华用了5分钟，小明比小华的速度快多少．
<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) / (1/5)</gadget>
<output>1/4 = around 0.25</output>

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