Two engineering teams, A and B, excavate a cave with a length of 320 meters from both sides of the mountain at the same time, and it takes 40 days to dig through it. It is known that engineering team A digs 4.15 meters every day, how many meters does engineering team B dig every day? (solution with equation)
甲、乙两个工程队从山的两边同时开挖一个长320米的山洞，40天挖通，已知甲工程队每天挖4.15米，乙工程队每天挖多少米？(用方程解答)
<gadget id="calculator">40 * 4.15</gadget>
<output>166</output>

<gadget id="calculator">320 - 166</gadget>
<output>154</output>

<gadget id="calculator">154 / 40</gadget>
<output>77/20 = around 3.85</output>

<result>77/20 = around 3.85</result>