Answer Posted / kanaha elangezhian

100 persons take 8 hrs 20 mins to spread the rumour to 200
persons
So the total people know the rumour in 8 hr 20 mins is 300
persons
For 600 persons 16hr 40 mins
4 hr 10 mins for 150 persons
20 hr 50 mins for 750 persons
35 mins for 18 persons
So the total time taken for spreading the rumour to 768
persons is 21 hr and 25 mins

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