Xiao Wang received a typing task and typed 800 words in the first 20 minutes, which was exactly 40% of the total number of words. According to this calculation, how many minutes will it take Xiao Wang to complete this task?
小王接到一项打字任务，前20分钟打了800个字，正好完成了总字数的40%．照这样计算，完成这项任务小王一共要用多少分钟．
<gadget id="calculator">40 / 100</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">(2/5) / 20</gadget>
<output>1/50 = around 0.02</output>

<gadget id="calculator">1 / (1/50)</gadget>
<output>50</output>

<result>50</result>