At a bus station, buses begin their routes at 6:00 a. m. The schedule for two of the buses is based on the time intervals listed below.
Bus A has a long route and leaves the station every 75 minutes.
Bus B has a short route and leaves the station every 15 minutes.
What is the next time Bus A and Bus B will leave the bus station at the same time?
A 7:00 a. m.
B 7:15 a. m.
C 7:30 a. m.
D 8:30 a. m