Four Pieces of Chain Puzzle


Four Pieces of Chain Puzzle

Four Pieces of Chain Puzzle

Efficient Work

Mark the blacksmith has four pieces of chain, each consisting of three rings.
He wants to obtain a single round chain as in the picture.

It takes Mark a minute to open a ring,
and another minute to close it.

How long will it take Mark to complete this task, at minimum?

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Answer :
Mark will take minimum 4 minutes to complete the task.

Explanation :
He will open the middle ring of one of the chain which will take him 1 minute.
So now he has 3 separate rings.
He will now join the remaining 3 pieces of chain using these 3 rings which will take hime 3 minutes.
So in total he will take 4 minutes to make a single round chain.