Question:
Five bells first begin to toll together and then at intervals of 3 s, 5s, 7s, 8s and 10 s. Find after what interval they will gain toll together?
A12 minutes
B15 minutes
C8 minutes
D14 minutes
Answer:
D. 14 minutes
Explanation:
Required time interval =LCM of (3, 5, 7,8 and 10) = 840 second = 14 minutes