Question

A tank is fillwed with 0.7m of water, a hole at the bottum of the tank with a radius of 0.001m is opened. At the same time, water is added to the tank at the same rate as it exits, calculate the speed at which water flows out from the hole.
I am using P=Po+pgh which gives me the pressure at the bottum of the tank:106867 Pa, I don't know how to relate this to velocity, help please?