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MGSM / 玛丽莎正在一条长 12 英里的小径上徒步旅行。她用了 1 小时走完前面 4 英里,然后再用一小时走完 2 英里。如果她希望平均速度达到每小时 4 英里,则要走完…

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玛丽莎正在一条长 12 英里的小径上徒步旅行。她用了 1 小时走完前面 4 英里,然后再用一小时走完 2 英里。如果她希望平均速度达到每小时 4 英里,则要走完剩下的距离,她的速度需要达到多少(以英里每小时为单位)?

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