So, we know the bus can hold 20 people in 15 minutes, so the rate per hour is:
20/15m
60m/15m4
20/15 x 4/4m80/60m (80 per hour)
4/1 = 4
80/60m x 4/4320/240m320/4h
320 people could ride the bus in 4 hours.
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