If he left his home at 7:50 a.m. and the distance to the pick-up point is 30 minutes away, he arrived at the pick-up point at 7:50 + 30 minutes = 8:20 a.m.
If the bus leaves at 8:00 a.m. every day, then Delaney was 8:20 a.m. - 8:00 a.m. = <<820-800=20>>20 minutes late when the bus had already left.
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