Question

the neon signboard of a jewellery shop has three colours. the logo of the shop in red, the name of the shop in green and the picture of the same jewellery in yellow. the logo comes on every 20 seconds. the name every 24 seconds. the picture of the jewellery shines every 12 seconds. all these three lights were switched on together. after how much time will all these three lights up together?​

Answer 1

All these lights are switched on together.

After the fixed time they will light up together.