Nuclear power stations are typically equipped with a RHR (residual heat removal) system to ensure long term decay heat removal following a reactor shutdown. What must the RHR coolant flow rate be in gpm (gallons per minute) to ensure the removal of 3.0×109 J of decay heat in 10 minutes if in removing the heat the coolant undergoes a specific enthalpy change of 10.3 Btu/lbm? Assume the specific volume of the RHR coolant is 0.018 ft3/lbm.