AMC8 1992
AMC8 1992 · Q18
AMC8 1992 · Q18. It mainly tests Rates (speed).
On a trip, a car traveled 80 miles in an hour and a half, then was stopped in traffic for 30 minutes, then traveled 100 miles during the next 2 hours. What was the car's average speed in miles per hour for the 4-hour trip?
在一趟旅行中，一辆汽车在1.5小时内行驶了80英里，然后在交通堵塞中停了30分钟，然后在接下来的2小时内行驶了100英里。这4小时旅行的汽车平均速度是多少英里/小时？
(A)
45
45
(B)
50
50
(C)
60
60
(D)
75
75
(E)
90
90
Answer
Correct choice: (A)
正确答案：（A）
Solution
Answer (A): During the 4 hours, the car traveled a total of 80 + 0 + 100 = 180 miles for an average speed of 180/4 = 45 miles per hour.
答案 (A)：4小时内，汽车总行驶80 + 0 + 100 = 180英里，平均速度180/4 = 45英里/小时。
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