Two sisters are running a race. They start from the starting point at the same time. When the elder sister runs halfway, the younger sister is 600 meters away from the finish line. When the older sister reaches the finish line, the younger sister has run 80% of the whole distance. How many meters are there in the whole race?
姐妹两人赛跑，她们同时从起点起跑，当姐姐跑完全程的一半时，妹妹离终点还有600米，而姐姐跑到终点时妹妹跑了全程的80%，赛跑全程有多少米？
<gadget id="calculator">80 / 100</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">(4/5) * (1/2)</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1 - (2/5)</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">600 / (3/5)</gadget>
<output>1_000</output>

<result>1_000</result>