AMC 8 1986 Problem 19
AMC8 1986 年第 19 题
行程问题★★★☆☆
At the beginning of a trip, the mileage odometer read 56,200 miles. The driver filled the gas tank with 6 gallons of gasoline. During the trip, the driver filled his tank again with 12 gallons of gasoline when the odometer read 56,560 . At the end of the trip, the driver filled his tank again with 20 gallons of gasoline. The odometer read 57,060 . To the nearest tenth, what was the car's average miles-per-gallon for the entire trip?
旅行开始时，里程表读数为 56,200 英里。驾驶员给油箱加了 6 加仑汽油。旅行中，当里程表读数为 56,560 时，驾驶员又加了 12 加仑汽油。旅行结束时，驾驶员再次加满 20 加仑汽油。里程表读数为 57,060。精确到十分位，汽车整个旅行的平均每加仑英里数是多少？
- A.22.5
- B.22.6
- C.24.0
- D.26.9
- E.27.5
正确答案 · Correct Answer
D
解析 · Solution
Solution 1
The car used 12 gallons of fuel during the first part of the trip and 20 gallons during the second part of the trip, for a total of 32 gallons. The total distance traveled during the trip was the difference between the final and initial odometer readings, that is, 57060 - 56200 = 860 miles. Therefore, the car's fuel efficiency was miles per gallon.
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