15 and 20 are both factors of 60
so the buses leave together on every whole hour ... 8, 9, 10, 11
aap bus service centre has two field services that start together at 8 a.m. bus leaves at 15 minutes interval while bus believes at 20 minutes interval on a particular day how many times do both services live together from 8 a.m. to 11 a.m.
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