OG(QR)PS-Q168

[oguz]

An airline passenger is planning a trip that involves three connecting flights that leave from Airports A, B,and C, respectively. The first flight leaves Airport A every hour, beginning at 8:00 a.m., and arrives at Airport B 2 1/2 hours later. The second flight leaves Airport B every 20 minutes, beginning at 8:00 a.m., and arrives at Airport C 1 1/6 hours later. The third flight leaves Airport C every hour, beginning at 8:45 a.m. What is the least total amount of time the passenger must spend between flights if all flights keep to their schedules?

(A)25 min
(B)1hr 5 min
(C)1hr 15 min
(D)2hr 20 min
(E)3hr 40 min
The answer is (B)

這題該如何下手較好?

[micki]

這題是OG 10th edition 的題目.

假設 8:00am 從A 機場出發, 經過2個小時30分到達B機場時間為 10:30

B機場從8:00am 開始每20分一班飛機到C機場...
所以你必須在B機場等10分鐘, 搭上10:40的飛機到C機場,
經過1個小時10分到達C機場時間為 11:50

C機場從8:45am 開始每一個小時一班飛機,
你只能在C機場等55分鐘, 搭12:45的飛機離開C機場

所以全部的等待時間 55 +10 = 65min = 1hr 5min

[oguz]

終於了解了
感恩!!

[jamesgenie]

有沒有人可以再幫我解說一下這個題目呢？

我的問題是，因為在題目中，問的是最少的待機時間
而非從八點出發後的待機時間

我算出來的是15分鐘，但連答案都沒得選說
誰能幫我解惑...please
=(