Question

13. There are four bells which ring at intervals of 5, 7, 20 and 28 seconds respectively. The four bells begin to ring at 10 o'clock. When will they next ring together ? show proper working !​

Answer 1

Answer:

Step-by-step explanation:

4=2×2

6=2×3

8=2×2×2

14=2×7

LCM of 4,6,8,14=2×2×2×3×7=168 seconds

= Bells will ring again 2 minutes 48 seconds after 12 O'clock

=12 hours 2 minutes 48 seconds