Master Wang processes a batch of parts and processes 20 pieces in 5 hours, which happens to be (1/3) of this batch of parts. According to this calculation, how many hours will it take to finish processing this batch of parts?
王师傅加工一批零件，5小时加工20个，刚好加工了这批零件的(1/3)，照这样计算，加工完这批零件需要多少小时？
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">20 / (1/3)</gadget>
<output>60</output>

<gadget id="calculator">20 / 5</gadget>
<output>4</output>

<gadget id="calculator">60 / 4</gadget>
<output>15</output>

<result>15</result>