Hrs-150.
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150 minutes
2 or 4.5 min.
2 + 2.5 = 4.5 minutes = 270 seconds
There are 150 minutes in 2+1/2 hours; there are 60 minutes per hour.
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?