The engineering team has to dig a 5.64km-long canal. The first week will average 0.42km per day, and then 0.45km per year. How many days will it take to complete the digging?
工程队要挖一条长5.64km水渠，第一周平均每天挖0.42km，以后每年天挖0.45km，还要多少天才能挖完？
<gadget id="calculator">0.42 * 7</gadget>
<output>2.94</output>

<gadget id="calculator">5.64 - 2.94</gadget>
<output>2.7</output>

<gadget id="calculator">2.7 / 0.45</gadget>
<output>6</output>

<result>6</result>