There is a 2.5-kilometer section of road that needs to be rebuilt. Engineering team A completed 400 meters and was replaced by engineering team B. It took 30 days for engineering team B to complete the rest. How many meters did engineering team B finish on average per day?
有一段2.5千米的道路需要改造，甲工程队完成400米后由乙工程队接替，乙工程队花了30天完成剩下的部分，乙工程队平均每天完成多少米？
<gadget id="calculator">2.5 * 1_000</gadget>
<output>2_500</output>

<gadget id="calculator">2_500 - 400</gadget>
<output>2_100</output>

<gadget id="calculator">2_100 / 30</gadget>
<output>70</output>

<result>70</result>