You are toasting the bread in a pan that can accommodate only two breads at one time.
What is the least amount of time by which you can toast all the three breads you have?
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It will take 15 Minutes.Suppose the three breads are a,b,c.
Side 1 (a) + Side 1(b) = 5 minutes
Side 1 (c) + Side 2(b) = 5 minutes
Side 2 (a) + side 2(c) = 5 minutes
So Total 15 minutes for toasting all the 3 breads