In a 10km race, when A reaches the finish line, he surpasses B by 2km and C by 4km. When B reaches the end point, how many kilometers is C away from the end point?
在10千米赛跑中，当甲到终点时，超过乙2千米，超过丙4千米．当乙到终点时，丙离终点还有多少千米．
<gadget id="calculator">10 - 2</gadget>
<output>8</output>

<gadget id="calculator">10 - 4</gadget>
<output>6</output>

<gadget id="calculator">8 / 6</gadget>
<output>4/3 = around 1.333333</output>

<gadget id="calculator">1 / (4/3)</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>