Build a road with a length of 1500 meters, the full length (2/5) was built 4 days ago. According to this calculation, how many days will it take to complete the road?
修一条长1500米的路，前4天修了全长的(2/5)．照这样计算，修完这条路共要多少天？
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">(2/5) / 4</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">1 / (1/10)</gadget>
<output>10</output>

<result>10</result>