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Quick and toasty

Question

three slices of bread are to be toasted under a grill. the grill can hold two slices at once but only one side is toasted at a time. it takes 30 seconds to toast one side of a piece of bread, 5 seconds to put a piece in or take a piece out and 3 seconds to turn a piece over. what is the shortest time in which the three slices can be toasted?

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1minute 10 seconds.

You toast two pieces of bread at once the first time (30 seconds) When they are both toasted on one side, take one of the pieces off (5 seconds) and put the untoasted piece of bread on the grill (5 seconds). Wait 30 seconds for the last piece to toast.

The riddle doesn’t say that you have to toast both sides of the bread. Instead of taking out both pieces the second time, you can unplug your grill (assuming the grill is electric).

Arguably, the shortest amount of time is 1 minute 13 seconds. You would use the added 3 seconds to flip the piece of bread that stays on the grill and make sure that it doesn’t burn.

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