To build a road with a length of 3120 meters, it was originally planned to be completed in 48 days, but the actual repair was 15 meters more per day. How many days will it take to fix this?
要修一条长3120米的公路，原计划48天完成，实际每天多修15米．这样要多少天才能修完？
<gadget id="calculator">3_120 / 48</gadget>
<output>65</output>

<gadget id="calculator">65 + 15</gadget>
<output>80</output>

<gadget id="calculator">3_120 / 80</gadget>
<output>39</output>

<result>39</result>