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Hub Central then Hub West then Hub Harbor: No
Hub Ridge then Hub East then Hub Valley: No
Hub North then Hub Harbor then Hub Valley: Yes
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
95%
(hard)
Question Stats:
40% (02:48) correct
60%
(02:30)
wrong
based on 141
sessions
History
Date
Time
Result
Not Attempted Yet
A regional courier makes exactly seven deliveries each day, to Delivery Hubs North, East, West, Central, Ridge, Harbor, and Valley. The hub receiving the shipment with the highest priority is visited first, and each subsequent delivery is scheduled to the hub with the shortest travel time from the one most recently served. The table below shows the travel times between these delivery hubs, in minutes.
On Thursday, the highest-priority shipment is to Hub Central, and the first delivery is therefore made to Hub Central.
For each of the following sequences of hubs, select Yes if the courier will visit the three hubs consecutively in the given order. Otherwise, select No.
| Hub | North | East | West | Central | Ridge | Harbor | Valley |
|---|---|---|---|---|---|---|---|
| North | 0 | 6 | 3 | 4 | 8 | 5 | 7 |
| East | 6 | 0 | 5 | 3 | 9 | 4 | 6 |
| West | 3 | 5 | 0 | 2 | 10 | 6 | 4 |
| Central | 4 | 3 | 2 | 0 | 5 | 7 | 6 |
| Ridge | 8 | 9 | 10 | 5 | 0 | 8 | 7 |
| Harbor | 5 | 4 | 6 | 7 | 8 | 0 | 3 |
| Valley | 7 | 6 | 4 | 6 | 7 | 3 | 0 |
On Thursday, the highest-priority shipment is to Hub Central, and the first delivery is therefore made to Hub Central.
For each of the following sequences of hubs, select Yes if the courier will visit the three hubs consecutively in the given order. Otherwise, select No.
| Yes | No | |
| Hub Central then Hub West then Hub Harbor | ||
| Hub Ridge then Hub East then Hub Valley | ||
| Hub North then Hub Harbor then Hub Valley |
ShowHide Answer
Official Answer
Hub Central then Hub West then Hub Harbor: No
Hub Ridge then Hub East then Hub Valley: No
Hub North then Hub Harbor then Hub Valley: Yes
Bunuel
The courier begins at the hub with the highest-priority shipment, which is Hub Central. After each delivery, the courier selects the next hub that has the shortest travel time from the most recently visited hub among those not yet served.
From Hub Central, the travel times are:
West 2, East 3, North 4, Ridge 5, Valley 6, Harbor 7.
The nearest is West, so the second stop is Hub West.
From Hub West, the travel times to unvisited hubs are:
Central (already visited), East 5, North 3, Ridge 10, Valley 4, Harbor 6.
The nearest is North (3), so the third stop is Hub North.
From Hub North, the travel times to unvisited hubs are:
East 6, Ridge 8, Harbor 5, Valley 7.
The nearest is Harbor (5), so the fourth stop is Hub Harbor.
From Hub Harbor, the remaining unvisited hubs are East, Ridge, and Valley.
Travel times: East 4, Ridge 8, Valley 3.
The nearest is Valley (3), so the fifth stop is Hub Valley.
From Hub Valley, the remaining unvisited hubs are East and Ridge.
Travel times: East 6, Ridge 7.
The nearest is East (6), so the sixth stop is Hub East.
The final unvisited hub is Ridge, so the last stop is Hub Ridge.
The full route is therefore:
Central → West → North → Harbor → Valley → East → Ridge
• Hub Central then Hub West then Hub Harbor
Central is followed by West, and West is followed by North, not Harbor. Hence this sequence does not occur.
Answer: No
• Hub Ridge then Hub East then Hub Valley
Ridge is the last stop, and East is visited before Ridge. Hence Ridge cannot precede East or Valley.
Answer: No
• Hub North then Hub Harbor then Hub Valley
North is followed by Harbor, and Harbor is followed by Valley in the route. Hence this sequence occurs.
Answer: Yes
I29-219
General Discussion
06 Oct 2025, 07:16
Kudos
Bookmarks
Hey Bunuel, I'm getting the answers as NO, NO, NO. I'll explain below how I get these answers, kindly explain me where I'm wrong.
Thanks in advance.
I evaluated the given sequences against the delivery rule (starting from Central, then to the nearest unvisited hub):
1. Hub Central - then Hub West - then Hub Harbor:
Starting at Central.
Nearest unvisited hub from Central is West.
Next from West: since Harbor is next in sequence, check if Harbor is nearest from West.
From West, nearest unvisited is North (3), then Harbor (6).
Because Harbor is not the nearest next from West (North is closer), this sequence is not followed.
So, for Central -> West -> Harbor: No.
2. Hub Ridge - then Hub East - then Hub Valley:
Starting at Central, not Ridge. Ridge is not the first hub (Central is), so the sequence doesn't start right.
So, for Ridge -> East -> Valley: No.
3. Hub North - then Hub Central - then Hub Ridge:
Starting at Central, not North.
So, for North -> Central -> Ridge: No.
Thanks in advance.
I evaluated the given sequences against the delivery rule (starting from Central, then to the nearest unvisited hub):
1. Hub Central - then Hub West - then Hub Harbor:
Starting at Central.
Nearest unvisited hub from Central is West.
Next from West: since Harbor is next in sequence, check if Harbor is nearest from West.
From West, nearest unvisited is North (3), then Harbor (6).
Because Harbor is not the nearest next from West (North is closer), this sequence is not followed.
So, for Central -> West -> Harbor: No.
2. Hub Ridge - then Hub East - then Hub Valley:
Starting at Central, not Ridge. Ridge is not the first hub (Central is), so the sequence doesn't start right.
So, for Ridge -> East -> Valley: No.
3. Hub North - then Hub Central - then Hub Ridge:
Starting at Central, not North.
So, for North -> Central -> Ridge: No.
