Master Wang used to process a batch of parts in 5 minutes, but completed the task in 2 minutes after the technology was updated. How much has his work efficiency improved?
王师傅原来5分钟加工一批零件，技术更新后2分钟就完成了任务，他的工作效率提高了多少
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">(1/2) - (1/5)</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">(3/10) / (1/5)</gadget>
<output>3/2 = around 1.5</output>

<result>3/2 = around 1.5</result>