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 Toast Schedule (Posted on 2013-05-13)
Ricardo's old toaster can hold at most two slices of bread and toast them on one side at a time. He wants his bread toasted on both sides and buttered on one side.

It takes:
• 3 seconds to put each slice into the toaster and,
• 30 seconds to toast one side of 1 or 2 slices and,
• 3 seconds to reverse a slice and,
• 12 seconds to butter one side (that side must already be toasted).
• 3 seconds to remove a slice from the toaster without putting it back in reverse.
Assuming that, only one of these operations can be done at a time:

In how short a time can Ricardo toast and butter three slices?

 No Solution Yet Submitted by K Sengupta Rating: 1.3333 (3 votes)

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 solution | Comment 1 of 3
` 1. Load slices A and B into toaster:  6 seconds. 2. Toast them                      : 30   3. Reverse slice A                 :  3 4. Remove slice B                  :  3 5. Place slice C in toaster        :  3 6. Toast                           : 30 7. Reverse slice C                 :  3 8. Remove slice A                  :  3 9. Reload slice B for opposite side:  310. Toast                           : 3011. Butter each desired side        : 36                                   ---------                                     150  sec. = 2.5 min.`

 Posted by Charlie on 2013-05-13 13:35:00

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