A wet cooling tower is to cool $60$ kg$/$s of water from $40$ to $26\backslash$deg C$.$ Atmospheric air enters the tower at $1$ atm with dry$-$bulb and wet$-$bulb temperatures of $20$ and $15\backslash$deg C$,$ respectively, and leaves at $34\backslash$deg C with a relative humidity of $80$ percent. Using the psychrometric chart, determine $($a$)$ the volume flow rate of air into the cooling tower and $($b$)$ the mass flow rate of the required makeup water.