From A to D is a puzzle in Professor Layton and the Unwound Future.


It takes 15 minutes to travel from station A, the first stop on the line, to station B.

It takes five minutes to travel from station B to station C.

It takes 10 minutes to travel from station C to the last station, station D.

However, it doesn't take 30 minutes to travel from station A to station D. Given that this is a straight railway line with no branches, how many minutes does it take to travel from A to D?


Click a Tab to reveal the Hint.

It's impossible?

Well, the conditions are all true, so there's no funny business going on there. Be flexible in your thinking and see if you can figure it out.

You need to reverse your thinking!

Station B must come after station A, right? Well, no, actually. That's just the order of letters in the alphabet!

In order to fulfill the conditions of the puzzle, the order of the stations must be A to C to B to D. With this knowledge, you should be able to figure out the time it takes to get from station A to D.



Too bad!

Try switching up your thought process.


Choo choo!

Twenty minutes is correct!

To meet the conditions of this puzzle, station C must be located between station A and station B.


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