A $1-$hr unit hydrograph for a watershed is given below. Calculate the peak flow $($cfs$)$ of the direct

runoff hydrograph for two consecutive effective $1-$hr storms of $0\mathrm{.}5$ in and $1\mathrm{.}5in.$

a$)975$

b$)1050$

c$)1100$

d$)875$