Dig a canal. After 6 days of digging, the midpoint exceeds 280 meters. The rest will continue to be dug at the original speed, and it can be completed in 5 days. How long is this canal in meters?
挖一条水渠，挖了6天后超过中点280米，剩下的按原来的速度继续挖，5天可以完成．这条水渠全长多少米？
<gadget id="calculator">6 - 5</gadget>
<output>1</output>

<gadget id="calculator">2 / 1</gadget>
<output>2</output>

<gadget id="calculator">6 + 5</gadget>
<output>11</output>

<gadget id="calculator">280 * 2 * 11</gadget>
<output>6_160</output>

<result>6_160</result>