In an adiabatic steady$-$state process, a stream of saturated steam at $350$ kPa is combined with

a stream of liquid water at $15\backslash$deg C to produce hot liquid water at $80\backslash$deg C at the rate of $4$ kg$/$s$.$ The

inlet line for the steam is $20$ mm in diameter. All other lines have much larger diameters.

Considering the kine@c energy of the steam, what flow rate of steam is required?