A person gives a secret to two other persons in 5 minutes. How long will he take to tell the secret to 768 people?

• 5 min -2 people
  10 - 4
  15 - 8
  20 - 16
  25 - 32
  30 - 64
  35 - 128
  40 - 256
  45 - 512
  47.5 - 768 people
  hence, ans is 47.5 minutes....
• 10 years agoHelpfull: Yes(8) No(13)
• In 1st 5 min -->> 3 ppl (1+2)
  in nxt 5 min these ppl will tel 6 other ppl.
  so aftr 10 min total nmbr of ppl 3+6=9.
  nw these 9 ppl nw tell secert to 18 other ppl.
  so aftr 15 min total; nmbe of ppl 9+18=27.
  so guys evry 5 min the nmbr of ppl gets tripled.
  5min--> 3
  10 min--> 9
  15--> 27
  20-->81
  25 min--> 243
  30 min-->729
  35-->729*3
  the required value
  so 35 min will be sufficient.
• 8 years agoHelpfull: Yes(5) No(0)
• 5 min -2 people
  10 - 6
  15 - 12
  20 - 24
  25 - 48
  30 - 96
  35 - 192
  40 - 384
  45 - 768 people
  hence, ans is 45 minutes....
• 9 years agoHelpfull: Yes(2) No(4)
• 5 min -2 people
  10 - 4
  15 - 8
  20 - 16
  25 - 32
  30 - 64
  35 - 128
  40 - 256
  45 - 512
  47.5 - 768 people
  hence, ans is 47.5 minutes....
  
• 9 years agoHelpfull: Yes(1) No(1)
• 5 min -2 people
  10 - 4
  15 - 8
  20 - 16
  25 - 32
  30 - 64
  35 - 128
  40 - 256
  45 - 512
  47.5 - 768 people
  hence, ans is 47.5 minutes....
• 8 years agoHelpfull: Yes(1) No(0)
• 1->2->4->8->16......->512->1024
  2^9=512
  After this definitely one person need 5 min to tell to others.
  So totally 10 * 5 min =50 min
• 8 years agoHelpfull: Yes(0) No(0)