AMC 8 2009 Problem 14
AMC8 2009 年第 14 题
行程问题★★★☆☆
Austin and Temple are 50 miles apart along Interstate 35. Bonnie drove from Austin to her daughter's house in Temple, averaging 60 miles per hour. Leaving the car with her daughter, Bonnie rode a bus back to Austin along the same route and averaged 40 miles per hour on the return trip. What was the average speed for the round trip, in miles per hour?
奥斯汀和坦普尔沿 35 号州际公路相距 50 英里。Bonnic 从奥斯汀开车到她女儿位于坦普尔的家，平均时速为 60 英里。Bonnie 之后把车留给了女儿，接着沿着同一条路线乘公共汽车返回奥斯汀，回程平均速度为每小时 40 英里。那么她往返的平均速度是多少英里每小时？
- A.46
- B.48
- C.50
- D.52
- E.54
正确答案 · Correct Answer
B
解析 · Solution
解析整理中
继续练习