Slice Toasting Riddle
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Christina makes tasty toast in a small pan. After toasting one side of a slice, she turns it over. Each side takes 30 seconds. The pan can only hold two slices.
How can she toast both sides of three slices in 1 & 1/2 instead of 2 minutes? 
Start with two slices. After 30 Sec. (one side of both slices done), flip one of the slices, set the other slice aside and put the third slice on the pan. After 30 more sec., the first slice is fully done whereas the third slice is half done. Flip the third slice, remove the first slice and replace it with the second slice which was set aside earlier (half done). In 30 more seconds, both the slices are fully done. Total time taken: 90 Sec. (1 and 1/2 min.)
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