A 400-meter-long road was built, and 120 meters were repaired in 3 days. According to this calculation, how many days will it take to complete the road?
修一段长400米的路，3天修了120米，照这样计算，修完这段路还需几天？
<gadget id="calculator">400 - 120</gadget>
<output>280</output>

<gadget id="calculator">120 / 3</gadget>
<output>40</output>

<gadget id="calculator">280 / 40</gadget>
<output>7</output>

<result>7</result>