A car averages 40 miles per hour for the first 6 hours of a trip and averages 60 miles per hour for each additional hour of trav

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问题 A car averages 40 miles per hour for the first 6 hours of a trip and averages 60 miles per hour for each additional hour of travel time, if the average speed for the entire trip is 55 miles per hour, how many hours long is the trip?

选项 A、8
B、18
C、24
D、12
E、16

答案C

解析本题考查行程问题。设一共行驶n小时，那么40×6+60×(n-6)=55n，得到n=24。

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A car averages 40 miles per hour for the first 6 hours of a trip and averages 60 miles per hour for each additional hour of trav

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