An engineering unit plans to build a road within a week. It will build a total of 6.8 kilometers in the first 3 days, and an average of 2.5 kilometers a day in the next 4 days. How many kilometers will be repaired on average in this week?
某工程兵部队计划在一周内修一条公路，前3天共修6.8千米，后4天平均每天修2.5千米，这一周平均每天修多少千米？
<gadget id="calculator">2.5 * 4</gadget>
<output>10</output>

<gadget id="calculator">6.8 + 10</gadget>
<output>16.8</output>

<gadget id="calculator">3 + 4</gadget>
<output>7</output>

<gadget id="calculator">16.8 / 7</gadget>
<output>2.4</output>

<result>2.4</result>