【汶川地震,震后2小时,某武警率部队从XX县出发去营救,13日凌晨1：15分动身,但途中遇到了麻烦,他们决定步行,但到达理县后因救人而耽误了1小时.随后,先派遣分队将步行速度提高了9分之1.于13】

　　汶川地震,震后2小时,某武警率部队从XX县出发去营救,13日凌晨1：15分动身,但途中遇到了麻烦,他们决定步行,但到达理县后因救人而耽误了1小时.随后,先派遣分队将步行速度提高了9分之1.于13日23时15分到达汶川~

　　求先遣分队从理县到汶川的平均速度是多少?

　　我会加的!

　　还求从开始到理县的时间从理县到汶川的速度和时间（这是表格）

　　从开始到理县是30千米,从理县到汶川是60千米

　　是求从XX县到理县的时间从理县到汶川的速度和时间

　　求先遣分队从理县到汶川的平均速度是多少?

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