On Sunday, Xiao Ming goes to the library to read a book. It is 2 kilometers from his home to the library, and he walks (1/2) the kilometer in (1/5) hour. At this speed, how long will it take Xiao Ming to reach the library?
星期天，小明到图书馆去看书，从他家到图书馆有2千米，他(1/5)小时走了(1/2)千米，照这样的速度，小明到图书馆需要多少时间？
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

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

<gadget id="calculator">2 / (5/2)</gadget>
<output>4/5 = around 0.8</output>

<result>4/5 = around 0.8</result>