Give the step-by-step reasoning process and then the final answer. Don can paint 3 tiles a minute, Ken can paint 2 more tiles a minute than Don and Laura can paint twice as many tiles as Ken. Kim can paint 3 fewer tiles than Laura can in a minute. How many tiles can Don, Ken, Laura and Kim paint in 15 minutes?
Ken paints 3 tiles / minute + 2 tiles / minute = 5 tiles / minute. Laura can paint 5 tiles / minute x 2 = 10 tiles / minute. Kim can paint 10 tiles / minute - 3 tiles / minute = 7 tiles / minute. All 4 can paint 3 tiles / minute + 5 tiles / minute + 10 tiles / minute + 7 tiles / minute = 25 tiles / minute. In 15 minutes, they can paint 15 minutes x 25 tiles / minute = 375 tiles.
The final answer: 375.