A puzzle 5

Algebra Level 2

A biology scientist was studying one of the types of micro-organisms,
he put one of them on an empty Microscope slide,
After 20 seconds , it split into 2 ,
After other 20 seconds , the 2 split into 4 ,
and so on.
After an hour , the slide became semi-filled.

How long more (in seconds) will it take the slide to become fully filled ?


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