It takes 10 minutes at the fastest to bake ten pieces of bread.

According to the meaning of the question, you can only bake two slices of bread at a time. Both the front and back sides must be toasted. It takes 1 minute to bake one side.

Then put in the two slices of bread at the same time and it is baked. It takes 1 1 = 2 minutes

Ten slices of bread are divided into 5 times, the total time = 2*5=10 minutes

So baking ten pieces of bread, the fastest it takes is 10 minutes.

Extended information:

This type of problem belongs to the pancake problem in mathematics. The formula of the pancake problem is:

Total time = number of pancakes × 2÷each pot The number that can be soldered × the time to solder each side

When the calculated time is not an integer, the one-step method is used to obtain an approximate number.

For example, the number of cakes is 4, the number of sheets in each pot is 3, and each side is baked for 2 minutes, according to the formula, 4×2÷3×2≈6 minutes

When When one pan can only bake two cakes: total time = time to bake one side × number of sheets