When A crosses the finish line in the 100-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, then when B reaches the finish line, they will be ahead of C. How many meters ahead?
当甲在100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，那么当乙到达终点的时侯，将比丙领先多少米？
<gadget id="calculator">100 - 89</gadget>
<output>11</output>

<result>11</result>