Question: A high school locker has a lock with sixty numbers on it: 0 through 59. To open the lock, you must enter a 3-number code.

A high school locker has a lock with sixty numbers on it: 0 through 59. To open the lock, you must enter a 3-number code. Suppose that it takes 1 minute to enter each code and you plan to try every possible code starting with 0-0-0, 0-0-1, 0-0-2, .... until you get to the last code 59-59-59. If the lock opens on the last code that you try, how long would it take to open the locker?

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