three different lights flash every 5 seconds, 8 seconds and 12 seconds respectively. if they start at the same time how long will it take for them to flash at the same time again?

Answer 1

common multiple
5
2*2*2
2*2*3
need
5 2 2 2 3
120

Answer 2

three different lights flash every 8 seconds every 5 seconds and every 12 seconds

Answer 3

What is answer