**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.