It takes 1.6 hours for the road roller to roll a section of road (2/5), how many hours will it take to finish this road with the same efficiency.
压路机用1.6小时压一段路的(2/5)，用同样的效率压完这条路还要多少小时．
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1 - (2/5)</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">(2/5) / 1.6</gadget>
<output>0.25</output>

<gadget id="calculator">(3/5) / 0.25</gadget>
<output>2.4</output>

<result>2.4</result>