$$2004-AMC10A-18$$  Brenda and Sally run in opposite directions on a circular track, starting at diametrically opposite points. They first meet after Brenda has run $$100$$ meters. They next meet after Sally has run $$150$$ meters past their first meeting point. Each girl runs at a constant speed. What is the length of the track in meters?  Brenda 和 Sally 在圆形轨道上以相反的方向奔跑，分别从一条直径的两个端点开始。 他们在 Brenda 跑了 100 米后第一次见面。 在 Sally 跑过他们的第一个会面点 150 米后，他们下一次见面。 每个女孩都以恒定的速度奔跑。 轨道的长度是多少米？
选项为:A:$$250$$  B:$$300$$  C:$$350$$  D:$$400$$  E:$$500$$  请回答其中一个选项.