An engineering team builds roads, and builds an average of 0.16 kilometers per day in the first 3 days, and a total of 0.78 kilometers in the next 4 days. How many kilometers is built on average this week?
一个工程队修筑公路，前3天平均每天修筑0.16千米，后4天共修筑0.78千米，这一星期平均每天修筑多少千米？
<gadget id="calculator">0.16 * 3</gadget>
<output>0.48</output>

<gadget id="calculator">0.78 * 4</gadget>
<output>3.12</output>

<gadget id="calculator">0.48 + 3.12</gadget>
<output>3.6</output>

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

<gadget id="calculator">3.6 / 7</gadget>
<output>0.514286</output>

<result>0.514286</result>