AMC8 1995

AMC8 1995 · Q25

AMC8 1995 · Q25. It mainly tests Rates (speed), Patterns & sequences (misc).

Buses from Dallas to Houston leave every hour on the hour. Buses from Houston to Dallas leave every hour on the half hour. The trip from one city to the other takes 5 hours. Assuming the buses travel on the same highway, how many Dallas-bound buses does a Houston-bound bus pass on the highway (not in the station)?

从达拉斯到休斯顿的巴士每整点发车。从休斯顿到达拉斯的巴士每半点发车。从一座城市到另一座城市需要5小时。假设巴士在同一公路上行驶，一辆去休斯顿的巴士在公路上（不在车站）会经过多少辆去达拉斯的巴士？

(A) 5 5

(B) 6 6

(D) 10 10

(E) 11 11

Answer

Correct choice: (D)

正确答案：（D）

Solution

A Houston-bound bus leaving Dallas at 6:00pm will arrive at 11:00pm, passing buses that left Houston at 1:30pm, 2:30pm, ..., 10:30pm: 10 buses.

一辆下午6:00从达拉斯出发去休斯顿的巴士，将于晚上11:00到达，会经过下午1:30、2:30、...、10:30从休斯顿出发的巴士：10辆。

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