When A crosses the finish line in a 60-meter race, he is 10 meters ahead of B and 20 meters ahead of C. If B and C continue to rush to the finish line at the original speed, how many meters will B be ahead of C when they reach the finish line? ．
当甲在60米赛跑中冲过终点线时，比乙领先10米、比丙领先20米，如果乙和丙按原来的速度继续冲向终点，那么当乙到达终点时将比丙领先多少米．
<gadget id="calculator">60 - 10</gadget>
<output>50</output>

<gadget id="calculator">60 - 20</gadget>
<output>40</output>

<gadget id="calculator">50 - 40</gadget>
<output>10</output>

<gadget id="calculator">10 / 50</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">10 * (1/5)</gadget>
<output>2</output>

<gadget id="calculator">10 + 2</gadget>
<output>12</output>

<result>12</result>