Two bells ring at intervals of 63 seconds and 74 seconds. If they both ring at 10 O'clock together, after how many seconds will they ring together again?

Correct option is A

Ans. (a)
Sol. To find when the bells will ring together again, we need to calculate the LCM (Least Common Multiple) of the two intervals (63 and 74 seconds).
· LCM(63, 74) = 4482 seconds. Thus, both bells will ring together again after 4482 seconds.
Explanation of each option:
· (a) 4482 – Correct answer. This is the LCM of 63 and 74.
· (b) 4662 – Not the correct LCM.
· (c) 4552 – Not the correct LCM.
· (d) 4772 – Not the correct LCM.