2 or 4.5 min.
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270 minutes.
Thirty seconds is one half minute. Four minutes is the product of eight half minutes (8/2=4).
1 and a half. There are one and a half minutes in one and a half minutes.
1 hour = 60 minutes → 4½ hours = 4.5 × 60 minutes = 270 minutes
A bacteria splits in half after 20 minutes, so that after 20 minutes there are 2 bacteria, and after 40 minutes there are 4 bacteria. How many bacteria will there be after 2 hours?