A freight train passes through a level crossing at a speed of 5 meters per second, taking 2 minutes and 40 seconds. Given that the length of each carriage (including the locomotive) is 12.5 meters, how many carriages does this freight train have in total ?
A. 64
B. 68
C. 72
D. 80
E. 96

Distance = speed × time中文
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Worked solution

1. 2026 AMC 8 官方解析

2分40秒=160秒2\text{分}40\text{秒} = 160\text{秒}
S火车=160×5=800(m)S_{\text{火车}} = 160 \times 5 = 800(\text{m})
节数 =800÷12.5=64= 800 \div 12.5 = 64（节）

Answer

A. 64

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