Process a batch of parts and complete (2/15) of this batch of parts in 4 hours. According to this calculation, how many hours will it take to complete the remaining parts?
加工一批零件，4小时完成这批零件的(2/15)，照这样计算，余下的零件几小时才能完成？
<gadget id="calculator">2 / 15</gadget>
<output>2/15 = around 0.133333</output>

<gadget id="calculator">1 - (2/15)</gadget>
<output>13/15 = around 0.866667</output>

<gadget id="calculator">(2/15) / 4</gadget>
<output>1/30 = around 0.033333</output>

<gadget id="calculator">(13/15) / (1/30)</gadget>
<output>26</output>

<result>26</result>