A, B, and C are in a 10-kilometer walking race. When A reaches the finish line, B is still 2 kilometers away from the finish line, and C is still 2 kilometers away from B. Then, when B reaches the finish line, C is still 2 kilometers away from the finish line. How many kilometers are there?
甲、乙、丙三人进行10千米的竞走比赛，当甲到终点时，乙离终点还有2千米，丙离乙还有2千米，那么，当乙到终点时，丙距终点还有几千米？
<gadget id="calculator">10 - 2 - 2</gadget>
<output>6</output>

<gadget id="calculator">10 - 2</gadget>
<output>8</output>

<gadget id="calculator">6 / 8</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">10 * (3/4)</gadget>
<output>15/2 = around 7.5</output>

<gadget id="calculator">10 - (15/2)</gadget>
<output>5/2 = around 2.5</output>

<result>5/2 = around 2.5</result>