Two masters and apprentices produce a batch of parts. If the master alone takes 20 hours and the apprentice alone 25 hours, how much faster is the master's work efficiency than the apprentice?
师徒二人生产一批零件，如果师傅单独做需20小时，徒弟单独做25小时，师傅的工作效率比徒弟快百分之几？
<gadget id="calculator">1 / 20</gadget>
<output>1/20 = around 0.05</output>

<gadget id="calculator">1 / 25</gadget>
<output>1/25 = around 0.04</output>

<gadget id="calculator">(1/20) - (1/25)</gadget>
<output>1/100 = around 0.01</output>

<gadget id="calculator">(1/100) / (1/25)</gadget>
<output>1/4 = around 0.25</output>

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