Dongsheng Township needs to dig a canal. A total of 800 meters has been dug in the first 3 days, and the rest will be dug within 6 days, 312 meters per day. How long is this canal?
东升乡要挖一条水渠，前3天一共挖了800米，剩下的要在6天内挖完，每天挖312米．这条水渠有多长？
<gadget id="calculator">312 * 6</gadget>
<output>1_872</output>

<gadget id="calculator">1_872 + 800</gadget>
<output>2_672</output>

<result>2_672</result>