The time for Xiao Li to process a part is reduced from 15 minutes to 10 minutes, how much his work efficiency has been improved.
小李加工一个零件的时间由原来的15分钟减少到10分钟，他的工作效率提高了多少．
<gadget id="calculator">3 - 2</gadget>
<output>1</output>

<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<result>1/2 = around 0.5</result>