Two cylindrical reservoirs $\text{'}A\text{'}$ and $\text{'}B\text{'}$ are connected by a $30$ m long pipe of

$250$ mm internal diameter as shown in Figure below. The Darcy$-$Weisbach friction

factor for the pipe is $0\mathrm{.}025.$ Initially the reservoir $\text{'}$ A $\text{'}$ was full at the indicated level

and reservoir $\text{'}$ B $\text{'}$ was empty. If the entrance and exit losses in this pipe are

neglected, the time required to empty the reservoir $\text{'}$ A $\text{'}$ in hour is

$($rounded off to $3$ decimal places$).$

Consider $=3\mathrm{.}14$ and acceleration due to gravity, $g=9\mathrm{.}81m{s}^{-2}.$ please tell with diagram $.$ The answer is $3\mathrm{.}3-3\mathrm{.}4$