甲、乙二车分别从两地相向开出，两地相距240千米，经2小时后二车相遇．若甲车的速度72千米/小时，求乙车的速度是多少？
∵v=
，∴甲车的路程s甲=v甲t=72km/h×2h=144km，s t
乙车的路程s乙=s-s甲=240km-144km=96km，
乙车的速度v乙=
=s乙 t
=48km/h；96km 2h
答：乙车的速度是48千米/小时．
| 从对话后的选项中选择适当的选项补全对话。 | |
| John: Hello, Mike. Do you like animals? Mike: Yes, I like them very much. I keep a cat, two dogs and five rabbits at home. John: Really? 1______ Mike: It's really interesting to keep pets (宠物) for it is a lot of fun to play with them. John: Do you have enough time to look after them? Mike: 2______ John: What is your father? Mike: 3______ He will treat them if they are ill. John: Are they often ill? Mike: 4______ Because we take good care of them every day. John: I think your pets must be very lovely. Mike: Thank you. Every day they make me laugh. John: 5______
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