A current of 2 A flows through a wire of crosssectional area 25.0 mm². The number of free electrons in a cubic meter are 2.0 x 10²⁸. The drift velocity of the electrons is _____ x 10⁻⁶ ms⁻¹ (Given, charge on electron = 1.6 x 10⁻¹⁹C)