从上海到南京的D412次列车组列车运行时刻表如下所示．
| 时间 | 上海 | 苏州 | 常州 | 南京 |
| 到站时间 | 09：51 | 10：33 | 11：45 | |
| 发车时间 | 09：15 | 09：53 | 10：35 | |
| 里程/km | 0 | 84 | 300 |
（2）若该列车从苏州到常州的平均速度为130km/h，则苏州到常州的里程为多少？（最后结果小数点后保留1位）
（1）上海到南京全程的时间t=11：45-9：15=150min=2.5h，
全程平均速度V=
=S t
=120km/h；300km 2.5h
答：列车由上海驶往南京全程的平均速度为120km/h．
（2）苏州到常州的时间：t′=10：33-9：53=40min=
h，2 3
苏州到常州的里程：
S′=vt′=130km/h×
h≈86.7km．2 3
答：苏州到常州的里程为86.7km．
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