Three fire houses are connected to a fire hydrant. Each hose has a radius of $0\mathrm{.}021$ m$.$ Water enters the hydrant through an underground pipe of radius $0\mathrm{.}080$ m$.$ In this pipe the water has a speed of $3\mathrm{.}1$ m$/$s$.($A$)$ how many kilograms of water are poured onto a fire in one hour by all three hoses? $($B$)$ find the water speed in each hose