Using one machine tool to process a batch of parts, (3/5) of this batch of parts can be processed in 0.4 hours. According to this calculation, how many hours will it take to finish processing this batch of parts?
用一台机床一批零件，0.4小时可加工这批零件的(3/5)，照这样计算，加工完这批零件还需几小时？
<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">1 - (3/5)</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">(3/5) / 0.4</gadget>
<output>1.5</output>

<gadget id="calculator">(2/5) / 1.5</gadget>
<output>0.266667</output>

<result>0.266667</result>