In a cafeteria, baked beans are served either in ordinary portions or in children's portions. The quantity given for an ordinary portion is a normal variable with mean 90 g and standard deviation 3 g and the quantity given for a child's portion is a normal variable with mean 43 g and standard deviation 2 g. What is the probability that Tom, who has two children's portions, is given more than his father, who has an ordinary portion?