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Virus doubles every 3 mins. It is 'K' in 1 hour, when was it K/4 ?

29 min
25 min
54 min
57 min

Correct Answer: 54 min

Explanation:

If virus is K in 1hr i.e 60 min
then in 57 min it was K/2 as it doubles every 3 minutes
=> In 54 min it was K/4.
At 54 minutes it was K/4.

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