The engineering team built a 2,100-meter-long tunnel, and 960 meters have been built. The rest needs to be completed in 4 days. How many meters are repaired per day on average?
工程队修一条长2100米的隧道，已经修了960米，剩下的要求4天修完，平均每天修多少米？
<gadget id="calculator">2_100 - 960</gadget>
<output>1_140</output>

<gadget id="calculator">1_140 / 4</gadget>
<output>285</output>

<result>285</result>