A secret can be told only 2 persons in 5 minutes .the
same person tells to 2 more persons and so on . How long
will take to tell it to 768 persons ?
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Answer Posted / krishna
1 person told 2 persons in 5 min
so these 3 will tell 6 persons in 10min
3-6-10min
9-18-15min
27-54-20min
81-162-25min
243-486-30min
so 243+486=729 people know the secret
768-729=39
these 39 people will get to know in another 5 mins so 35 is the ans
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