1 hour = 60 minutes.
90% (or 0.9) of 60 minutes = 54 minutes.
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The duration of time between 9:00AM and 6:15PM is 9 hours and 15 minutes.
If in 3 hours it will be midday, then the current time is 9:00 AM. This is because midday is 12:00 PM, so subtracting 3 hours gives us 9:00 AM.
The time from 10 AM to 9 PM is 11 hours. You can calculate this by counting the hours from 10 AM to 9 PM, which includes 11 full hours.
6 hours 35 minutes