In a 10-kilometer race, assuming that the speeds of A, B, and C remain constant, when A reaches the finish line, B is still 2 kilometers away from the finish line, and C is 4 kilometers away from the finish line. How many kilometers is the end point.
在10千米赛跑中，假设甲、乙、丙三人的速度保持不变，当甲到达终点时，乙还距终点2千米，丙距终点4千米，当乙到达终点时，丙距离终点多少千米．
<gadget id="calculator">2 * 10</gadget>
<output>20</output>

<gadget id="calculator">2 * 4</gadget>
<output>8</output>

<gadget id="calculator">20 - 8</gadget>
<output>12</output>

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

<gadget id="calculator">12 / 8</gadget>
<output>3/2 = around 1.5</output>

<gadget id="calculator">4 - (3/2)</gadget>
<output>5/2 = around 2.5</output>

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