An engineering team wants to build a 3,000-meter-long road, and 2/5 of the roads are built in 10 days. According to this calculation, how many days will it take to finish the road? (Solve with ratio)
一个工程队要修一条3000米长的公路，10天修了这条公路的(2/5)，照这样计算，修完这条公路还要多少天？(用比例解)
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">(2/5) * 10</gadget>
<output>4</output>

<gadget id="calculator">10 - 4</gadget>
<output>6</output>

<gadget id="calculator">6 / (2/5)</gadget>
<output>15</output>

<result>15</result>