2014年临沂市中考数学试卷及答案word版(11)

t 25,解得 ········································································································· （4分）

s 1500.

∴乙出发5分钟后与甲相遇. ··················································································· （5分） （2）（本小问4分）

设当60≤t≤90时，乙步行由景点B到C的速度为v米／分钟， 根据题意，得5400-3000-(90-60)v≤400， ·························································· （2分）

200

··············································································· （3分） 66.7 .

3

∴乙步行由B到C的速度至少为66.7米／分钟. ·················································· （4分） 25. 证明：

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