Question

Three builders are laying a brick wall.

Fred can lay 1000 bricks in three hours, Jimmy can lay 1000 bricks in two hours and Kev can lay 1000 bricks in six hours.

How long will it take Fred, Jimmy and Kev to lay 1000 bricks if they all work together?

Answer 1

1/3+1/2+1/6 =(2+3+1)/6 1hour