A radial flow problem for a production well was given the following information. Reservoir pay zone thickness $=58ft,$ Porosity $=20\%,Pe=2800,Pw=110,k=100md,Re=660ft,Rw=0\mathrm{.}32ft,=1\mathrm{.}2cp,$ please calculate

$(1)$ The oil production flow rate in bbl$/$day$.$

$(2)$ Pressure gradients $($dp$/$dr$)$ at points A$,$ B separately!