Show me the steps to solve b$)$ The data of a mass curve of an isolated storm over a catchment is given in Table Q$3($b$).$ If

the storm produced a direct runoff of $1\mathrm{.}5$ cm at the outlet of the catchment, solve for the $-$

index of the storm and the duration of the rainfall excess. $($CO$2-$PO$2-$C$3)$

Table Q$3($b$)$

i need all the answer with the all steps