The flow rate section calculate the total pressure drop kpa

1.Figure shows a series-parallel piping system in which all pipes are 8 cm diameter. If the flow rate at section 2 is 35 L/s calculate the total pressure drop (p1 − p2) in kPa, assuming that the fluid is water at 20ºC. Neglect minor losses and consider a friction factor f = 0.025 for all pipes.

Data L1 = 20 m, D1 = 25 cm, f1 = 0.02 and L2 = 15 m, D2 = 15 cm, f2 = 0.015, Kelbow = 0.5