The sign says keep off the grass. Each day Michael has to get from one corner of the rectangular area of the grass to the opposite corner. If the park keeper is looking he will walk along the edges but if the park keeper is not looking he will take the direct route diagonally across the rectangle.

How much further does Michael walk on the days when the keeper is looking? The length of the rectangular area of the grass is 154m and the width is 93m. Give answer to the nearest metre