bus travels from A to B in 0.8 hours (1/5), how many hours will it take to travel (1/2) the whole way?
一辆客车从甲地开往乙地，0.8小时行了全程的(1/5)，行了全程的(1/2)需要多少小时．
<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">(1/5) / 0.8</gadget>
<output>0.25</output>

<gadget id="calculator">(1/2) / 0.25 / 1</gadget>
<output>2</output>

<result>2</result>