Brain Teaser: The Digital Twin Synchronization Problem

A factory has four production lines, each with a digital twin that updates every:

• Line 1: Every 2 minutes

• Line 2: Every 3 minutes

• Line 3: Every 5 minutes

• Line 4: Every 7 minutes

If all digital twins synchronize their data at 9:00 am, when will be the next time that all four will have fresh, synchronized data simultaneously?

Answer: At 12.30 pm. 210 minutes later. This is the least common multiple of 2, 3, 5, and 7, which is 210 minutes.