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Mark drives from home to work. The total distance of the drive is 150 miles. During the first half of the drive, Mark drives at a speed of 30miles/hour. During the second half of the drive, Mark drives at a speed of 50miles/hour. Which of the following statements must be true?
Indicate all such statements.
Indicate all such statements.
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以上解析由 考满分老师提供。
