一辆汽车在长为150km的一段公路上行驶，整段路程的平均速度为50km/h．已知在前70km路程中，汽车用了1h，则剩下的路程中汽车要以______km/h的平均速度行驶．
（1）汽车全程的行驶时间：
t=
=s v
=3h，150km 50km/h
（2）剩下的路程中用的时间：
t2=t-t1=3h-1h=2h，
剩下的路程中汽车的平均速度：
v2=
=s2 t2
=40km/h．150km-70km 2h
故答案为：40．
| 阅读理解。 |
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