Answer:
Kirk started making the cake batter at 3:48 P.M. and it took him 1 hour and 3 minutes to make the batter. So he finished making the batter at 3:48 P.M. + 1 hour and 3 minutes = 4:51 P.M.
Then, the cake baked in the oven for 1 hour and 8 minutes. So the cake came out of the oven at 4:51 P.M. + 1 hour and 8 minutes = 5:59 P.M.