The cooling water from the condenser of a power plant enters a wet cooling tower at 105oF at a rate of 90 lbm/s. The water is cooled to 85oF in the cooling tower by air which enters the tower at 1 atm, 73oF, 50% relative humidity and leaves saturated at 90oF. Neglecting the power input to the fan, determine (a) the volume flow rate of the air into the cooling tower and (b) the mass flow rate of the required makeup water.