Two shifts carry the same amount of books, the first shift has already shipped (2/5) the task, and the second shift still has (2/5) unloaded at this time, of the two shifts, which shift is the fastest? How much faster?
两个班运同样多的书，一班已运了任务的(2/5)，二班这时还有(2/5)没有运，两个班，哪个班运得快？快几分之几？
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1 - (2/5) - (2/5)</gadget>
<output>1/5 = around 0.2</output>

<result>1/5 = around 0.2</result>