Li Xiang wants to dig a 30-kilometer canal. It has been dug for 2 days, 4.8 kilometers per day, and the rest needs to be dug in 3 days. How many kilometers do you need to dig on average per day?
李乡要挖一条长30千米的水渠，已经挖了2天，每天挖4.8千米，剩下的要求3天挖完，平均每天要挖多少千米？
<gadget id="calculator">4.8 * 2</gadget>
<output>9.6</output>

<gadget id="calculator">30 - 9.6</gadget>
<output>20.4</output>

<gadget id="calculator">20.4 / 3</gadget>
<output>6.8</output>

<result>6.8</result>