Working together, decorating 16 dozens of cookies will take 103 minutes.
Let's calculate theor individual work rate :
Felix's rate = 1/90
Oscar's rate = 1/120
Combined rate = 1/90 + 1/120 = (4 + 3) / 360 = 7/360
Time taken for both of the to decorate 8 dozens :
Reciprocal of their combined rate = 1 ÷ (7/360) = 51.428571 minutes
Hence, the time taken to decorate 16 dozens will be :
(16/8) × 51.428571 = 102.857 = 103 minutes (nearest while number).
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