The swimming pool at Spring Valley High School is a rectangle with a width of 70 meters and a length of 25 meters. Around the perimeter of the pool is a tiled floor that extends w meters from the pool

The swimming pool at Spring Valley High School is a rectangle with a width of 70 meters and a length of 25 meters. Around the perimeter of the pool is a tiled floor that extends w meters from the pool on all sides. Find an expression for the area of the tiled floor.