Please help me figure out how my professor solved this problem

Problem (1) You are given a chunk of copper metal. (a) How much charge is in a square block of side a :=10.0. cm ? (b) If it takes At:=1.0. hr for a charge to move a distance "a" what is the drift speed of the particle? (c) Using the drift speed determine the current that will flow across the block. ncop := 8.5 . 10". m de := 1.602 . 10 " C Acon -a- -0.01 m V cop: -a - 0.001 m' ( b) val a (2.778 . 10 5) m At S (a) cop: ncop. de" V cop= (1.362 . 10' ) C (c) I avg QCOP _(3.783 . 103) A At