Three fire hoses are connected to a single fire hydrant. Each hose has a radius of $0\mathrm{.}020$ m$.$ Water enters the hydrant through an underground pipe of radius $0\mathrm{.}080$ m$.$ In this pipe the water has a speed of $3\mathrm{.}0$ m$/$s$.($a$)$ Find the speed in each hose. $($b$)$ How many kilograms of water are poured onto a fire in one hour by all three hoses?