Question

Four bells ring at intervals of 8, 12, 18 and 20 minutes respectively. At what time will they ring together if they
start ringing simultaneously at 9 a.m.?

Answer 1

Answer:

12 Noon

Step-by-step explanation:

Four bells rings at intervals of 8, 12, 18, and 20 minutes respectively. They have ringee simultaneously at 9 AM.

Next time, they will ring simultaneously after the LCM of 8, 12, 18, and 20 minutes.

The LCM of 8, 12, 18, and 20 is 180. Therefore the bell will ring after 180 minutes. 180 minutes = 3 hours. (1 hour = 60 minutes)

Next time the bell will ring at 9 AM + 3 hours = 12 Noon