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Xiaohua's family will make three cakes in 16 minutes, and then catch the train, but it takes five minutes to bake two sides of a cake, and only two cakes can be baked in one pot at a time.
Solution: Three cakes are represented by serial numbers 1, 2 and 3 respectively:
First time: 1 plus 2 plus, it takes 5 minutes.
The second time: 1 reverse, 3 positive, takes 5 minutes.
The third time: 2 confrontations, 3 confrontations, which took 5 minutes.