All this is a unit conversion really, initially you'll need to put the 460.28 oz over the 12.44 hours. Your expression should read as 460.28 oz/12.44 hr, next simply divide and you will have your answer of 37 oz/hr
Length squared + width squared = Diagonal squared
Length squared = 900cm
Width squared = 256cm
total = 1156
Therefore Diagonal squared = 1156
Diagonal = 34cm