An air compressor is used to pressurize an initially evacuated tank. The tank dimensions are diameter D = 2 ft, height = H = 6 ft. The pipe supplying the air is d = 3 inches in diameter and the velocity v is 5 ft/s . The output pressure and temperature are constant, with the pressure to the tank being 50 psi and a temperature of 32 o C. The tank temperature is at 21 o C. How long does it take for the tank pressure to reach 15 psi