To build a road with a length of 3333.1 meters, the full length (3/7) was built in 3 days. According to this calculation, how many days will it take to build this road?
修一条长3333.1米的路，3天修了全长的(3/7)，照这样计算，修这条路，一共要多少天？
<gadget id="calculator">3 / 7</gadget>
<output>3/7 = around 0.428571</output>

<gadget id="calculator">(3/7) / 3</gadget>
<output>1/7 = around 0.142857</output>

<gadget id="calculator">1 / (1/7)</gadget>
<output>7</output>

<result>7</result>