A manuscript, Qianqian types it every hour (2/5), how many hours does it take Qianqian to finish typing this manuscript.
一份稿件，倩倩平均每小时打它的(2/5)，倩倩需要多少小时打完这份稿件．
<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>

<result>5/2 = around 2.5</result>