Question

A bell rings every 2 hours, a second bell rings every 3 hours, and a third bell rings every 4 hours. If all 3 bells ring at 9:00am., at what time will all 3 bells next ring?

Answer 1

find the lowest common multiple of all 3 bells... that will give how many hours later they will ring together

Answer 2

They'll ring at 9 pm.