A road with a total length of 25 kilometers is built, and the full length (1/5) is repaired in 3 days. According to this calculation, how many days will it take to complete the road?
修一条全长25千米的公路，3天修了全长的(1/5)，照这样计算，修完这条公路一共需要多少天？
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">(1/5) / 3</gadget>
<output>1/15 = around 0.066667</output>

<gadget id="calculator">1 / (1/15)</gadget>
<output>15</output>

<result>15</result>