It takes 3 minutes to produce a part, which is 1 minute shorter than before. How much is the time shortened?
生产一种零件，现在每个用3分钟，比原来缩短了1分钟，时间缩短了百分之几？
<gadget id="calculator">3 + 1</gadget>
<output>4</output>

<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

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