A bacteria undergoes binary fission in every minute. This bacterium can fill up a cup in 1 hour. In how much time will the cup be half filled?

30 minutes

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59 minutes

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20 minutes

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40 minutes

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Solution

The correct option is D 59 minutes
It is given that, the bacteria undergoes binary fission in every minute. It means it has doubling time of 1 minute. It doubles in every minute. The bacteria can fill up a cup in 1 hour. Hence, in 59 minutes, the cup will be half filled. So, during the 60 $^{t h}$ minute, the bacteria will double and the cup will be full filled from half filled.
Thus, the correct answer '59 minutes.'

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