one electronic device beeps once every 60 seconds and anothe

one electronic device beeps once every 60 seconds and another electronic device beeps once every 62 seconds. They both beep at 10am..what time will it be when they both beep at the same time again?

62*60=62 minutes which would be 11:02 am for sure
but are there any before that?
x*62 =60y
31x=30y
so at 10:31 am they would both beep together.