If an athlete practices long-distance running and his speed increases by 5%, how much time will be reduced
某运动员练习长跑，速度比原来提高了5%，则时间减少多少
<gadget id="calculator">5 / 100</gadget>
<output>1/20 = around 0.05</output>

<gadget id="calculator">1 + (1/20)</gadget>
<output>21/20 = around 1.05</output>

<gadget id="calculator">1 / (21/20)</gadget>
<output>20/21 = around 0.952381</output>

<gadget id="calculator">1 - (20/21)</gadget>
<output>1/21 = around 0.047619</output>

<result>1/21 = around 0.047619</result>