runs 3 meters per second, B runs 4 meters per second, and C runs 2 meters per second. The three run from the same point and direction at the same time along a 600-meter circular track. How long does it take for the three to start at the same time?
甲每秒跑3米，乙每秒跑4米，丙每秒跑2米，三人沿600米的环形跑道从同一点、同时同方向跑步，经过多少时间三人又同时人出发点出发？
<result>10</result>