Can anyone help me to solve this question?

Question

a neon light blinks in every 10 seconds and a bell rings in every 15 seconds.If both the light and the bell blinks and rings together at 10:30 in the morning,at what time will the light and the bell blinks and rings together again?

Answer 1

L every 10 sec

B every 15

LCM is 30 10 divides 30 and 15 divides 30. 10 = 2x5, 15=3x5, 2x3x5 = 30

in 30 seconds both will ring together

10:30:30 am or 10:30.5 am or 10:30 1/2 am, half way between 10:30 and 10:31