Least Common Multiple (LCM) — Definition & Examples

Alice, Bob, and Conner work in the same company. Alice comes to work every $6$ days, Bob every $15$ days, and Conner every $4$ days. If the three worked together today, how many days later would they be working together again?

Hint: $LCM(a,b,c) = LCM(LCM(a,b),c)$