$\backslash$table$[[,,],[($b$),\backslash$table$[[$A rapid sand filters is constructed to treat water with flow rate of $0\mathrm{.}88\frac{m^3}{s}.$ If the$],[$design loading is $300\frac{m^3}{?}$ d$.m^2,$ determine the number of rapid sand filters$],[$required$.$ Given that the maximum dimensions is $7\mathrm{.}5$ m and the length to width$],[$ratio is $1\mathrm{.}2$:$1.]],],[,,$ marks$)]]$