Answer:
1 minute
Explanation:
If the buses run 8 minutes from 7:00 a.m to 11:00am, you arrive at the bus stop at 8:19 a.m, the difference between the time you arrived and the time the next bus would leave may be determined by the analysis below;
Between 7:00am to 8:04am (64 minutes), the bus would have moved 8 times. The ninth time the bus would move is at 8:12am and then at 8:20am.
As such, if you arrived the bus stop at 8:19am, you would only have to wait for a minute for the bus.