L D[AR2P#0.0]
Lifetime Supporting Member
Following on from Daba's train puzzle, here's another and it really does involve cats!
Answers via PM
Code:
A train travelling at contant speed approaches a tunnel.
At the entrance and exit of the tunnel
are two trained measuring cats that walk at exactly
the same speed in 1 metre steps.
When the train reaches the tunnel entrance
the first cat walks in the opposite direction
to the train travel and stops when it reaches
the end of the train.
When the front of the train comes out of the tunnel,
the other cat walks
in the same direction as the train and keeps walking until
the rear of the train passes it.
Each cat walks an integer number of steps
and the total number of steps in their measurement is less than 11.
The cats pass on the puzzle details and total number of steps
to a passing dog and ask him to determine the length of the train.
The dog says "I can't tell you the length of the train, I need more information"
The cats tell the dog that the train is shorter than the total
length they have walked.
The dog says "Thank you, I can now determine the length of the train".
How long is the train in metres?
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