Least Common Multiples and Linear Inequalities

One neon sign flashes every 6 seconds. Another neon sign flashes every 8 seconds. If they flash together and you begin counting seconds, how many seconds after they flash together will they next flash together?

How often do the maintenance staff have to clean the salesroom, offices, and storeroom on the same day if they clean the salesroom every 4th day, the offices every 6th day, and the storeroom every 10th day?

Smallest positive integer divisible by 4, 5, and 6?

What is the smallest nonzero whole number that is divisible, separately, by each of 2, 3, 4, 5, and 8 (with no remainder)?

What is the smallest positive whole number that is divisible with zero remainder by both 15 and 12?

Inequality for riding the “Big Dipper” Roller Coaster if height in inches is represented by h.