A and B are running a 3600-meter race. When A is 600 meters away from the finish line, B is still 1200 meters away from the finish line. According to this calculation, when A runs to the finish line, how many meters away from the finish line does B have.
甲、乙进行3600米赛跑，甲离终点还有600米时，乙离终点还有1200米，照这样计算，当甲跑到终点时，乙离终点还有多少米．
<gadget id="calculator">1_200 - 480</gadget>
<output>720</output>

<result>720</result>