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Toast Schedule (Posted on 2013-05-13) Difficulty: 3 of 5
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)

Comments: ( Back to comment list | You must be logged in to post comments.)
Solution 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:  3
10. Toast                           : 30
11. Butter each desired side        : 36
                                   ---------
                                     150  sec. = 2.5 min.

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