Li Zhuang wants to build a 1,200-meter-long road, and 40% of it was completed in the first two days. According to this calculation, how many days will it take to build this road?
李庄要修筑一条长1200米的道路，前2天完成了40%．照这样计算，修筑这条路一共要用多少天？
<result>6</result>