Explanation:
3 buses leave the station at 9 am. Bus A had a six minute route, Bus B had a 12 minute route and Bus C had a 16 minute route. When are all of them back at the station?
Find LCM via prime factorization
6 = 2 x 3
12 = 2 x 2 x 3
16 = 2 x 2 x 2 x 2
2 x 2 x 2 x 2 x 3 = 48 minutes