A train travels from Beijing to Tianjin at an average rate of 40 miles per hour in the morning, and then comes back from Tianjin

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问题 A train travels from Beijing to Tianjin at an average rate of 40 miles per hour in the morning, and then comes back from Tianjin to Beijing at an average rate of 50 miles per hour at night.
Quantity A: the average speed of the train in a whole day
Quantity B: 45 miles per hour

选项 A、Quantity A is greater.
B、Quantity B is greater.
C、The two quantities are equal.
D、The relationship cannot be determined from the information given.

答案D

解析由于我们无法知道一共有多少距离，所以此题无法求得平均速度，选择D。

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本试题收录于： GRE QUANTITATIVE题库GRE分类

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A train travels from Beijing to Tianjin at an average rate of 40 miles per hour in the morning, and then comes back from Tianjin

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GRE

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