Toasting Bread

Your toaster is broken, so you decide to toast your bread in a pan. The pan can hold three slices of bread at a time and takes 1 minute to toast one of their sides. How much time would it take you to toast four slices of bread on both sides using the pan?

SOLUTION

It would take you 2 minutes and 40 seconds. Label the slices with A, B, C, D, their top sides A1, B1, C1, D1, and their bottom sides A2, B2, C2, D2.

Toast A1, B1, C1 for 40 seconds.
Toast A2, B2, D1 for 40 seconds.
Toast A1, C2, D2 for 20 seconds.
Toast A2, C2, D2 for 20 seconds.
Toast B1, C1, D1 for 20 seconds.
Toast B2, C2, D2 for 20 seconds.

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