I need a step by step solution thanks. $10-35$ A water treatment plant is designed at a flow rate of $0\mathrm{.}425m^3*s^{-1}.$ The water is to flow into four primary settling tanks operating in parallel. A detention time of $2\mathrm{.}5$ hours has been determined to be effective. Using a length to width ratio of $2$:$1$ and an effective depth of $3\mathrm{.}5m,$ calculate the length of the tank in meters.