Mechanical energy balancel Friction losses

Water at $20C($density $=1000k\frac{g}{m^3},$ viscosity $=0\mathrm{.}001k\frac{g}{m}.s)$ flows through a turbine at $16\frac{m^3}{h}$ as shown in Figure $1.$ The lengths of the pipes are $40m,24m$ and $50m$ for the $5-cm$ pipe, $15-cm$ pipe, and $7\mathrm{.}5-cm$ pipe respectively. All the pipes are made of cast iron. The $5-cm$ pipe consist of three $90$ elbows and there is a wide open globe valve in the $7\mathrm{.}5-cm$ pipe.

a$)$ Calculate all the frictional losses in the system in $\frac{J}{k}g.$

b$)$ Assuming the exit elevation is zero, calculate the power extracted by the turbine in $kW$ if the efficiency of the turbine is $85\%.$