Two tanks A and B, of constant cross-sectional areas of 10 m² and 2.5 m², respectively, are connected by a 5cm pipe, 100 m long, with f =0.03. If the initial difference of water levels is 3m, how long will it take for 2.5 m³ of water to flow from A to B? Considering entry and exit losses, it can be grossly assumed that the flow velocity, in m/s, through the pipe is 1.75 h, where h is in m, taking g = 10 m/sec²; also, may take area of pipe as 2 × 10^–3 m²