汽车从A站出发,以90Km/h的速度行驶了20min后到达B站,又以60Km/h的速度行驶了10min到达C站,问（1）AB两站相距多远？（2）汽车从A站到C站的平均速度？
Our School Library
—Have you ever listened to any Internet songs?
—Sure I have! And some of them _______ really great!
已知：△ABC中，AB=AC，∠B=α．
