FREEZING SEVEN ICE CUBE TRAYS

 

You have an old-fashioned refrigerator with a small freezer compartment that could hold seven ice cube trays stacked vertically, but there are no shelves to separate the trays. You have an unlimited supply of trays, each of which can make a dozen cubes, but if you stand one tray on top of another before it’s frozen, it will nest part way into the one below and you won’t get full cubes from the bottom tray. Given these constraints, what is the fastest way to make ice cubes?

 

FREEZING SEVEN ICE CUBE TRAYS

 




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