Xiao Lin and Xiao Ning are running a long-distance race. They start from the starting point at the same time. When Xiao Lin reaches the finish line, Xiao Ning is still 400 meters away from the finish line. It is known that the speed ratio of Xiao Ning and Xiao Lin is 4:5. How many meters to race?
小林和小宁进行长跑比赛，两人同时从起点出发，当小林到达终点时，小宁离终点还有400米，已知小宁和小林的速度的比是4：5，两人进行的是多少米的比赛？
<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">1 - (4/5)</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">400 / (1/5)</gadget>
<output>2_000</output>

<result>2_000</result>