Question

two light house can be seen from the top of a hill the first flashes once every 12 seconds and the other precious once every 7 seconds if they flash at the same time how long will it be until the flash at the same time again​ please answer correct

Answer 1

Find atleast common multiple of 8 and 5

Prime factor 8: 2,2,2

Prime factor 15:3*5

=120 seconds ( 2 minutes )

LCM: 2*2*2*2*3*5

.

.

They will flash together at 12:02am