To pave a 106.8-kilometer road, team A paves 5.4 kilometers per day on average. After 7 days, team B joins in paving the road together. The two teams pave together and complete the task after 6 days. How many kilometers does team B pave on average per day?
要铺设一条长106.8千米的公路，甲队平均每天铺5.4千米，7天后乙队一起参加铺路，两队合铺6天后完成任务，乙队平均每天铺设多少千米？
<gadget id="calculator">5.4 * 7</gadget>
<output>37.8</output>

<gadget id="calculator">106.8 - 37.8</gadget>
<output>69</output>

<gadget id="calculator">69 / 6</gadget>
<output>23/2 = around 11.5</output>

<gadget id="calculator">(23/2) - 5.4</gadget>
<output>6.1</output>

<result>6.1</result>