Pipe Flow Calculations Forum

Suppose I have 3 inch pipe, i.e. (a) ---------- (b) 80 meter long. Pump is throwing water at 50 m^3/hr at end (a). Now if pump speed is changed to 40 m^3/hr then, what is the effect on the far end of pipe at 80 meter away at (b)? After how much time t, the flow will become 40 m^3/hr at the far end (...