Question

two bells ring at an interval of 15 and 20 minutes if the bells ring together at 1 p.m. at what time will they ring together again​

Answer 1

Answer:

10.10AM I THINK SO

Step-by-step explanation:

Answer 2

Answer: In simple way, we need to find the lowest number, which is fully divisible bh 10, 15 and 20. So let's find the PCM of these 3, and that is 60mins.

So 60 minutes after 12 o'clock, all 3 bells will ring together again, ie at 1 o'clock.

Another way, non math way, to solve this is

BellA will ring at 12:00, 12:10, 12:20, 12:30, 12:40, 12:50, 1:00

BellB will ring at 12:00, 12:15, 12:30, 12:45, 1:00

BellC will ring at 12:00, 12:20, 12:40, 1:00

So, after ringing together at 12 o'clock, the bells will again ring together at 1 o'clock.