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题目内容双击单词支持查询和收藏哦～
A car travels d miles along a stretch of highway at a constant speed of r miles per hour and then travels d miles back to its starting point at a constant speed of s miles per hour, where r > s .
Quantity A
The time taken by the car to travel the d miles at r miles per hour
Quantity B
$$\frac{d}{s}$$ hours
B显示答案
以上解析由 考满分老师提供。
