From the school to the Cultural Palace, A takes 20 minutes and B takes 16 minutes. How much faster is B than A?
从学校到文化宫，甲用20分钟，乙用16分钟，乙速度比甲快多少．
<gadget id="calculator">1 / 16</gadget>
<output>1/16 = around 0.0625</output>

<gadget id="calculator">1 / 20</gadget>
<output>1/20 = around 0.05</output>

<gadget id="calculator">(1/16) - (1/20)</gadget>
<output>1/80 = around 0.0125</output>

<gadget id="calculator">(1/80) / (1/20)</gadget>
<output>1/4 = around 0.25</output>

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