Q3
Six bells commence tolling together and toll at intervals of 2, 4, 6, 8 10 and 12 seconds respectively. In 30 minutes, how many times do they toll together ?
A.
4
B.
10
C.
15
D.
16
AnswerAnswer: Option D
Solution
Answer: Option D
Solution:
L.C.M. of 2, 4, 6, 8, 10, 12 is 120.So, the bells will toll together after every 120 seconds(2 minutes).
In 30 minutes, they will toll together
+ 1 = 16 times