Problem $1$

A Basin in San Mateo, CA has been developed into a $1\mathrm{.}5$ acre park and $3\mathrm{.}5$ acres of residential $($apartments$).$ The times of concentration $($Tc$)$ for the park and residential area are $30$ and $10$ minutes respectively. Using Rational method, Calculate the $25-$ year design peak flow at the basin outlet.

$\backslash$table$[[$Park$,$Residential area$],[A=1\mathrm{.}5ac,A=3\mathrm{.}5a$

Can you please help me solve this step by step it is a homework question not a exam question