A road was built in Xingfu Village. The engineering team started construction on May 11 and repaired 80m per day. It was completed on May 31. What is the total length of this road in meters?
幸福村修一条公路，工程队5月11日动工，每天修80m，5月31日修完，这条公路全长多少米．
<gadget id="calculator">31 - 11</gadget>
<output>20</output>

<gadget id="calculator">20 + 1</gadget>
<output>21</output>

<gadget id="calculator">80 * 21</gadget>
<output>1_680</output>

<result>1_680</result>