Xiao Li processes a batch of parts and completes (2/5) of the total number in 5 hours. How many hours will it take to process all parts?
小李加工一批零件，5小时完成了总数的(2/5)，全部加工完需要多少小时．
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1 / (2/5)</gadget>
<output>5/2 = around 2.5</output>

<gadget id="calculator">5 * (5/2)</gadget>
<output>25/2 = around 12.5</output>

<result>25/2 = around 12.5</result>