Suppose there is a human named Bob outside his appartment complex.
Bob forget his keys, so he logically decided to climb a pole to his appartment.
Like pictured below.

Bob's appartment is 60 meters above the ground.
Bob can climb 6 meters a minute, but every 6 meters Bob falls down 5 meters.

How many minutes does it take Bob to get to his appartment?



Answer:
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