Can you break down the solution for me for this math problem: Jordan wanted to surprise her mom with a homemade birthday cake.  From reading the instructions, she knew it would take 20 minutes to make the cake batter and 30 minutes to bake the cake.  The cake would require 2 hours to cool and an additional 10 minutes to frost the cake.  If she plans to make the cake all on the same day, what is the latest time of day that Jordan can start making the cake to be ready to serve it at 5:00 pm?