To find the number of hours from 5:30 to 9:00, first convert the times to a 24-hour format: 5:30 is 17:30 and 9:00 is 21:00. The difference between 21:00 and 17:30 is 3 hours and 30 minutes. Therefore, there are 3.5 hours from 5:30 to 9:00.
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