Which will hold more cake batter the rectangular pan or two round pans

Will have to compare volume amount of the pans
rectangular pan we do lxwxh
13x9x2=234in^3 cake batter

cylinder pan we do 
= 100.531

and since we get two round pans, the total amount of batter we get from round pans are around 201.062

so rectangular pan wins with more cake batter.

16 minutes is correct