23
Q:
A) 45 min | B) 25 min |
C) 30 min | D) 36 min |
Answer: C) 30 min
Explanation:
Explanation:
After 5 mins ..... 3 persons will get rumour
After 10 mins .... 3x2 + 3 = 9 = persons will get
after 15 =5x3 min ......9x2 + 9 =27 = persons will get news.
.
.
after 5x6 mins ... = 729 persons will get news.
Therefore, time taken to spread the rumour to 729 persons is 30 minutes.