A sprinter can run 240 feet in 8 seconds. Find the sprinter's unit rate of feet per second.
To find the unit rate of feet per second, we need to divide the total distance of 240 feet by the time of 8 seconds.
Therefore, the sprinter's unit rate is 240 feet / 8 seconds = <<240/8=30>>30 feet per second. Answer: \boxed{30}.