Refer to the above block diagram. If the flow rate of stream $1=240k\frac{g}{m}in,$ then:

The mass flow rate of $P$ in stream $1=k\frac{g}{m}in(2s.f)$

The mass flow rate of $P$ stream $6=k\frac{g}{m}in(2s.f)$

The total mass flow rate of stream $6=k\frac{g}{m}in(3s.f)$

The total mass flow rate of stream $3=k\frac{g}{m}in(4s.f)$