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Three builders are laying a brick wall.

Freddie can lay 1,000 bricks in three hours, Jimmy can lay 1,000 bricks in two hours and Kevin can lay 1,000 bricks in six hours.

How long will it take Freddie, Jimmy, and Kevin to lay 1,000 bricks if they all work together?

Puzzle Copyright © Kevin Stone

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Workings

Hint
How many bricks are laid in six hours?

Answer
1 hour.

Reasoning
How many bricks are laid in six hours?

In six hours, Kevin lays 1000 bricks, Freddie lays 2000 bricks, and Jimmy lays 3000 bricks.

So, in six hours, we have a total of 6000 bricks laid.

Which means that it will take one hour to lay 1000 bricks.

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