Shanghai World Expo bus No.1, No.2 and No.3 start from the starting point at 6 a.m?

Shanghai World Expo bus No.1, No.2 and No.3 start from the starting point at 6 a.m?

This is the least common multiple of three numbers·
It's 60
It means 60 minutes later, 7 a.m

Daxing square is the starting point of No.1 bus and No.5 bus. No.1 bus leaves every 6 minutes and No.5 bus leaves every 10 minutes
After the departure, at least how many minutes will it start from the starting point at the same time?

Reply:
This should be a mathematical problem of finding the least common multiple
The least common multiple of 6 and 10 is 30. That is 2 * 3 * 5 = 30
So in another 30 minutes, they will start at the same time
This is the order
Route 1: 1 at 0:00, 2 at 6:00, 3 at 12:00, 4 at 18:00, 5 at 24:00 and 6 at 30:00
Route 5: 1 at 0:00, 2 at 10:00, 3 at 20:00 and 4 at 30:00

There are No.1, No.2 and No.3 starting points in a station. No.1 starts every 10 minutes, No.2 starts every 12 minutes, and No.3 starts every 8 minutes
These three buses leave at 6:15 this morning. When is the earliest time to start at the same time?

The least common multiple of 8, 10 and 12 is 120, so the first 120 minutes later, that is 8:15, the three buses will start at the same time