A farmer wants to plant with her planter set to deliver 7.1 inch seed spacing for corn with 30 inch row spacing. She plans to plant with a travel speed of 5.5 mph and experience from past years indicates the ground drive slip has typically been 9%. The metering units on the planter have 25 cells per revolution. If the planter has been upgraded and the metering units are to be hydraulically driven this year, how fast (rpm) should the metering units be rotating? At what theoretical rate (cells/s) must each metering unit be delivering seeds to its seed tube?