Answer:
384
Explanation:
if each person who knows it tell 2 people then its doubling every hour
and for 8 hours the equation is
3x
(to seventh power because 1st hour already happened)
3x2x2x2x2x2x2x2
6x2x2x2x2x2x2
12x2x2x2x2x2
24x2x2x2x2
48x2x2x2
96x2x2
192x2
384