問題詳情：
濟南與*兩地相距480千米，乘坐高鐵列車比乘坐普通快車能提前4小時到達．已知高鐵列車的平均行駛速度是普通快車的3倍，求高鐵列車的平均行駛速度.
【回答】
解：設普通快車的速度爲xkm/h，由題意得：·················································· 1分
·································································································· 3分
=4············································································································ 4分
x=80················································································································ 5分
經檢驗x=80是原分式方程的解········································································ 6分
3x=3×80=240 ·································································································· 7分
答：高鐵列車的平均行駛速度是240km/h．····················································· 8分
知識點：分式方程
題型：解答題
